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Science Forum Index » Astro Forum » Pulsar oscillations due to magnetic field reversals
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| Guest |
Posted: Sat Feb 10, 2007 12:18 pm |
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The traditional view of pulsar radiation frequency is dependent on the
rate of rotation of the neutron star at it's centre. It seems likely
that together with other cosmic objects with magnetospheres, including
our earth and sun, that a pulsar may be subject to the same
phenomenon. I came to the conclusion a few days ago, but I am not the
first with this idea: http://www.cosis.net/abstracts/COSPAR2006/01770/
COSPAR2006-A-01770.pdf?PHPSESSID=70b66b95a0d4ed74826465a72635029c
The pulsar magnetic field oscillation model and the verification ...
This may cause researchers to rethink their theories on pulsar
structure, electrodynamics and magnetosphere structure, allowing the
rate of spin to be independent of the frequency of emissions.
I am led to believe that this magnetic field polarity reversal may
explain many of the difficulties encountered in Pulsar research.
I believe that the neutron star is made of superfluid neutrons, with a
relatively small amount of transient proton and electron superfluid
components, which vary in proportion at the same rate as the magnetic
flux reversal, creating an alternating protonic/electronic current,
and the pulsar dynamo is in effect an alternator. Plasma ions and dust
in an accretion disk are predominantly infalling due to the
gravitational attraction of the star, electrons are stripped from the
plasma and infall along the magnetic flux lines where the magnetic
field overcomes the gravitational attraction for the lighter
particles. The different paths taken by positive and negative
particles, lead to a regular polarisation reversal of the star,
leading to the alternator effect,, and thus any particles trapped in
the closed magnetic flux start to travel in the opposite direction,
creating the electromagnetic radiation we observe. At the poles,
electrons are trapped in open flux lines, and create the polar jets of
radiation as they vibrate towards and away from the star with each
reversal of field. Near the surface of the star there is such an
intense magnetic field near the poles where electrons reach
relativistic speeds and enter the star, rapidly neutralising the
protons as they travel through the superfluid neutron matrix, nearer
the equator, positive ions and dusty plasma attracted by the
gravitational field enter (and become) the atmosphere of the star, at
relativistic speeds, and are transformed into degenerate neutrons and
protons, which flow towards the negatively charged pole. I guess that
during this transformation, the high energy radiation is formed,
which illuminates the gas in the region of the pulsar. I will leave
the maths to those who understand it.
I assume that the rate of infalling matter would initially be rather
chaotic, but once an accretion disk had evolved, the rate would become
more or less constant, until the pulsar had moved out of the ejecta
cloud remnants of the supernova, where matter would either become more
sparse, or possibly, richer, if a nebula or sufficiently dense star is
encountered closely.
If the star mops up enough matter over time, the path lengths of the
positive and negatively charged particles in the neutron superfluid
increase, following their spiral course between equatorial and polar
regions, decreasing the rate of reversal, as the mass of the neutron
star increases. The spin rate, which I would suggest is much larger
that the reversal oscillation frequency, would also decrease over time
as the object becomes more massive.
The magnetic field of the pulsar bears no relationship to the initial
magnetic field of the mother star before it's supernova event, since
different dynamo principles are in effect. The original star's
magnetic field is totally disrupted by the supernova effect.
The superfluid nature of the neutron star is interesting, and would
create a dynamo effect all by itself, as long as it was moving or
rotating and it's temperature was above 0 deg. K, even if there were
no plasma to feed it. A sphere consisting of neutrons would have
faults, continually changing position due to the impossibility of
packing a sphere with identical particles, which I assume themselves
have a spherical conformation. Faults in the neutron shell would have
a tendency to allow protons and electrons to form.
Consider incompressible spheres e.g. ball bearings (neutrons) in a
rectangular box with all of the dimensions slightly larger than the
size of each layer (concentric spherical layers), a few layers thick,
being shaken (thermal effects at any temperature above absolute zero).
The ball bearings would settle into lattices with cracks between them,
and the cracks would change randomly with each shake, and ball
bearings would exchange between layers. In the temporary gap between,
a neutron decomposes to electron (free) and proton with limited
range.The next shake and the electron is separated from it's
original partner but in greater proximity to another proton held in
the lattice, and fuses with it, much in the way that electrons and
holes move in a semiconductor. Any motion of the star, and a current
and magnetic field element has been produced. |
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| Guest |
Posted: Sat Feb 10, 2007 5:03 pm |
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On 10 Feb, 16:18, c0h0...@hotmail.com wrote:
Quote: The traditional view of pulsar radiation frequency is dependent on the
rate of rotation of the neutron star at it's centre. It seems likely
that together with other cosmic objects with magnetospheres, including
our earth and sun, that a pulsar may be subject to the same
phenomenon. I came to the conclusion a few days ago, but I am not the
first with this idea:http://www.cosis.net/abstracts/COSPAR2006/01770/
COSPAR2006-A-01770.pdf?PHPSESSID=70b66b95a0d4ed74826465a72635029c
The pulsar magnetic field oscillation model and the verification ...
This may cause researchers to rethink their theories on pulsar
structure, electrodynamics and magnetosphere structure, allowing the
rate of spin to be independent of the frequency of emissions.
I am led to believe that this magnetic field polarity reversal may
explain many of the difficulties encountered in Pulsar research.
I believe that the neutron star is made of superfluid neutrons, with a
relatively small amount of transient proton and electron superfluid
components, which vary in proportion at the same rate as the magnetic
flux reversal, creating an alternating protonic/electronic current,
and the pulsar dynamo is in effect an alternator. Plasma ions and dust
in an accretion disk are predominantly infalling due to the
gravitational attraction of the star, electrons are stripped from the
plasma and infall along the magnetic flux lines where the magnetic
field overcomes the gravitational attraction for the lighter
particles. The different paths taken by positive and negative
particles, lead to a regular polarisation reversal of the star,
leading to the alternator effect,, and thus any particles trapped in
the closed magnetic flux start to travel in the opposite direction,
creating the electromagnetic radiation we observe. At the poles,
electrons are trapped in open flux lines, and create the polar jets of
radiation as they vibrate towards and away from the star with each
reversal of field. Near the surface of the star there is such an
intense magnetic field near the poles where electrons reach
relativistic speeds and enter the star, rapidly neutralising the
protons as they travel through the superfluid neutron matrix, nearer
the equator, positive ions and dusty plasma attracted by the
gravitational field enter (and become) the atmosphere of the star, at
relativistic speeds, and are transformed into degenerate neutrons and
protons, which flow towards the negatively charged pole. I guess that
during this transformation, the high energy radiation is formed,
which illuminates the gas in the region of the pulsar. I will leave
the maths to those who understand it.
I assume that the rate of infalling matter would initially be rather
chaotic, but once an accretion disk had evolved, the rate would become
more or less constant, until the pulsar had moved out of the ejecta
cloud remnants of the supernova, where matter would either become more
sparse, or possibly, richer, if a nebula or sufficiently dense star is
encountered closely.
If the star mops up enough matter over time, the path lengths of the
positive and negatively charged particles in the neutron superfluid
increase, following their spiral course between equatorial and polar
regions, decreasing the rate of reversal, as the mass of the neutron
star increases. The spin rate, which I would suggest is much larger
that the reversal oscillation frequency, would also decrease over time
as the object becomes more massive.
The magnetic field of the pulsar bears no relationship to the initial
magnetic field of the mother star before it's supernova event, since
different dynamo principles are in effect. The original star's
magnetic field is totally disrupted by the supernova effect.
The superfluid nature of the neutron star is interesting, and would
create a dynamo effect all by itself, as long as it was moving or
rotating and it's temperature was above 0 deg. K, even if there were
no plasma to feed it. A sphere consisting of neutrons would have
faults, continually changing position due to the impossibility of
packing a sphere with identical particles, which I assume themselves
have a spherical conformation. Faults in the neutron shell would have
a tendency to allow protons and electrons to form.
Consider incompressible spheres e.g. ball bearings (neutrons) in a
rectangular box with all of the dimensions slightly larger than the
size of each layer (concentric spherical layers), a few layers thick,
being shaken (thermal effects at any temperature above absolute zero).
The ball bearings would settle into lattices with cracks between them,
and the cracks would change randomly with each shake, and ball
bearings would exchange between layers. In the temporary gap between,
a neutron decomposes to electron (free) and proton with limited
range.The next shake and the electron is separated from it's
original partner but in greater proximity to another proton held in
the lattice, and fuses with it, much in the way that electrons and
holes move in a semiconductor. Any motion of the star, and a current
and magnetic field element has been produced. |
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| Craig Markwardt |
Posted: Sat Feb 10, 2007 10:30 pm |
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Guest
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c0h0nes@hotmail.com writes:
Quote: The traditional view of pulsar radiation frequency is dependent on the
rate of rotation of the neutron star at it's centre. It seems likely
that together with other cosmic objects with magnetospheres, including
our earth and sun, that a pulsar may be subject to the same
phenomenon. I came to the conclusion a few days ago, but I am not the
first with this idea: http://www.cosis.net/abstracts/COSPAR2006/01770/
COSPAR2006-A-01770.pdf?PHPSESSID=70b66b95a0d4ed74826465a72635029c
The pulsar magnetic field oscillation model and the verification ...
This may cause researchers to rethink their theories on pulsar
structure, electrodynamics and magnetosphere structure, allowing the
rate of spin to be independent of the frequency of emissions.
I am led to believe that this magnetic field polarity reversal may
explain many of the difficulties encountered in Pulsar research.
I believe that the neutron star is made of superfluid neutrons, with a
relatively small amount of transient proton and electron superfluid
components, which vary in proportion at the same rate as the magnetic
flux reversal, creating an alternating protonic/electronic current,
and the pulsar dynamo is in effect an alternator. Plasma ions and dust
Note that this has no similarity to the solar or terrestrial magnetic
field reversal process (which is a convective "alpha-dynamo").
Also note that magnetic field reversals in dynamos like the earth or
sun occur over many hundreds or thousands of rotation cycles. Thus,
one would infer from your "belief" that the actual neutron star
rotation speed would need to be much faster than the pulsation rate.
On the other hand, some pulsars pulse at rates which are within a
factor of a few of the break-up rotation speed for a neutron star (few
milliseconds). Thus, there is no realistic way to produce such
oscillations.
Finally note that no plausibility has been given to explain how
magnetic field reversals would produce ultra-stable pulsations over
tens of years (with stabilities that rival atomic clocks on earth).
CM |
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| Rob |
Posted: Sat Feb 10, 2007 10:49 pm |
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Guest
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On Feb 10, 9:30 pm, Craig Markwardt
<craigm...@REMOVEcow.physics.wisc.edu> >
Quote: Also note that magnetic field reversals in dynamos like the earth or
sun occur over many hundreds or thousands of rotation cycles. Thus,
one would infer from your "belief" that the actual neutron star
rotation speed would need to be much faster than the pulsation rate.
On the other hand, some pulsars pulse at rates which are within a
factor of a few of the break-up rotation speed for a neutron star (few
milliseconds). Thus, there is no realistic way to produce such
oscillations.
Finally note that no plausibility has been given to explain how
magnetic field reversals would produce ultra-stable pulsations over
tens of years (with stabilities that rival atomic clocks on earth).
Many good ideas start out in the "impossible" category.
A couple of good examples are relativity, atoms, electron spin and
Wegner's continental drift.
It is good to bring up and discuss conflicts between current
observations and the new idea, but history suggests that we should be
careful about summarily dismissing the idea, since unexpected
resolutions of the apparent conflicts are possible, as was the case in
the examples mentioned above.
Science = skepticism + open mind.
Rob |
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Posted: Sun Feb 11, 2007 7:42 am |
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On 11 Feb, 02:30, Craig Markwardt
<craigm...@REMOVEcow.physics.wisc.edu> wrote:
Quote: c0h0...@hotmail.com writes:
The traditional view of pulsar radiation frequency is dependent on the
rate of rotation of the neutron star at it's centre. It seems likely
that together with other cosmic objects with magnetospheres, including
our earth and sun, that a pulsar may be subject to the same
phenomenon. I came to the conclusion a few days ago, but I am not the
first with this idea:http://www.cosis.net/abstracts/COSPAR2006/01770/
COSPAR2006-A-01770.pdf?PHPSESSID=70b66b95a0d4ed74826465a72635029c
The pulsar magnetic field oscillation model and the verification ...
This may cause researchers to rethink their theories on pulsar
structure, electrodynamics and magnetosphere structure, allowing the
rate of spin to be independent of the frequency of emissions.
I am led to believe that this magnetic field polarity reversal may
explain many of the difficulties encountered in Pulsar research.
I believe that the neutron star is made of superfluid neutrons, with a
relatively small amount of transient proton and electron superfluid
components, which vary in proportion at the same rate as the magnetic
flux reversal, creating an alternating protonic/electronic current,
and the pulsar dynamo is in effect an alternator. Plasma ions and dust
Note that this has no similarity to the solar or terrestrial magnetic
field reversal process (which is a convective "alpha-dynamo").
Also note that magnetic field reversals in dynamos like the earth or
sun occur over many hundreds or thousands of rotation cycles. Thus,
one would infer from your "belief" that the actual neutron star
rotation speed would need to be much faster than the pulsation rate.
On the other hand, some pulsars pulse at rates which are within a
factor of a few of the break-up rotation speed for a neutron star (few
milliseconds). Thus, there is no realistic way to produce such
oscillations.
Finally note that no plausibility has been given to explain how
magnetic field reversals would produce ultra-stable pulsations over
tens of years (with stabilities that rival atomic clocks on earth).
CM
The quoted poster abstract (link split at end of line) is reproduced
below:
/quote
The pulsar magnetic field oscillation model and the
verification method
Z.X. Liang (1), Y. Liang (2)
(1) KPT lab, Shijiazhuang, China, (2) College of Physics, Jilin
University, China
(kpt01@heinfo.net / Phone: +86-311-87704264)
The characteristics of pulsar have been most commonly explained using
lighthouse
model. However, our research has demonstrated that the characteristics
of pulsar can
be better described using a magnetic oscillating model (hereafter MO
model) built by
analogising the reversing phenomenon of the solar magnetic field to
pulsar. Although
the mechanism why the magnetic field can oscillate has not been known
yet, no observed
oppositions to it (MO model) have been found either. After comparing
with the
lighthouse model, the MO model has the following advantages:
1. The prediction of the MO model differs significantly from the
prediction of the
lighthouse model. The MO model predicts that the geodetic precession
of the spin
axis in binary pulsar system may result in some slight changes of the
amplitude and
shape of profile, but it is impossible that they disappear from our
line of sight. The
observed results of PSR B1913+16, PSR J0737-3039 and other binary
pulsar system
have shown obviously such tendency.
2. The lighthouse model can be ruled out by the result from
calculating the micropulse
of PSR B1133+16. The wheel-axis structure of the image of Crab Nebula
taken by
Chandra X-ray Observatory correlates precisely with the prediction of
the MO model.
3. The MO model is more appropriate to explain the polarization
characteristics,
glitch, the interpulse and the generation rate of the pulsar than the
lighthouse model.
The MO model also gives satisfactory results to explain the other
characteristics, eg,
the spin-down, the pulse nulling, the beat and pulse drift, the rate
of the rotating energy
loss and the accuracy of the magnetic field oscillation, and so on.
It is popularly believed that the accuracy of the solar magnetic field
oscillation period
is lower, the accuracy of the period of the pulsar is higher. However,
up till today,
we only have the records of 24 solar periods (22 years per period). If
24 periods are
arbitrarily selected out from the single pulse data of the pulsar, its
period accuracy is
roughly equivalent to the accuracy of the solar period. Therefore, the
period accuracy
cannot be used for the argument to negate the MO model.
In addition, we recommend the study of Sweep Delay Effect of pulsar in
order to
determine the correct model between Lighthouse and Magnetic Field
Oscillating.
/unquote
There are many unsatisfactory and untenable theories re. pulsars that
may be disproved by the maths. A lot of work, is pure theorising -
what if... how does it fit the observations etc.
For instance work on superconductors in the lab has been extrapolated
to a postulated frozen magnetic field in neutron stars, which we can
usually only observe as pulsars, which are dynamic evolving energetic
systems, exchanging mass and energy in their various environments,
unlike the small scale static experiments on superconductors at low
temperature. The theory has not been falsified, but there are
observations that it may take hundreds of years for a supernova
remnant to develop an observable magnetic neutron star (NS) at its
midst, and that any frozen magnetic field must be self contained
within the star. Duh!
If magnetic field is not observable, it may not exist at all. "But it
must be there!" is just another belief, not testable.
One belief could be that the star is rotating near its maximum angular
velocity of the order of 3000Hz, and that magnetic field is disrupted
as it plows through the corotating plasma. Indeed researchers are
finding it strange that the fastest pulsar has a frequency of only
715Hz, whereas speeds of up to the maximum have been postulated. This
is just one more criticism of the lighthouse theory. Most pulsars
should be spinning faster than we can observe on the basis of the
lighthouse theory.
In some pulsars, the frequency is not stable over time. Others have
sub-pulses and glitches, which may be analogous to solar sunspot
activity.
If we believe that the collapsed mass in an NS conserves the angular
momentum of the progenitor star, that the magnetic field is conserved
to produce some of the strongest magnets in the universe, why not that
the reversal of magnetic field of the old star is also conserved, but
the rate increases to fit the size of the resulting NS?
We can only believe that a certain set of parameters operate in a
system, that is only incompletely available for observation. Then we
test them, ie, attempt to show that the belief is false. If it is not
false, it may be the answer, unless a better theory comes along. |
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| Joseph Lazio |
Posted: Sun Feb 11, 2007 1:19 pm |
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Guest
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Quote: "R" == Rob <rloldershaw@amherst.edu> writes:
R> On Feb 10, 9:30 pm, Craig Markwardt
R> <craigm...@REMOVEcow.physics.wisc.edu> >
Quote: Also note that magnetic field reversals in dynamos like the earth
or sun occur over many hundreds or thousands of rotation cycles.
Thus, one would infer from your "belief" that the actual neutron
star rotation speed would need to be much faster than the pulsation
rate. On the other hand, some pulsars pulse at rates which are
within a factor of a few of the break-up rotation speed for a
neutron star (few milliseconds). Thus, there is no realistic way to
produce such oscillations.
[...]
R> It is good to bring up and discuss conflicts between current
R> observations and the new idea, but history suggests that we should
R> be careful about summarily dismissing the idea, since unexpected
R> resolutions of the apparent conflicts are possible, as was the case
R> in the examples mentioned above.
I don't see Craig's comments as summarily dismissive. He points to a
very real problem. The typical time scale for a field reversal is
many rotation periods. If pulsar pulses are due to a field reversal,
that requires the neutron star be spinning much, much faster than the
pulse period. In turn, this would require at least some pulsars to be
rotating at speeds well in excess of their break-up speed (i.e., the
speed at which the rotational velocity at the surface exceeds the
escape velocity).
If you want this idea to be remotely close to accurate, you have to
also abandon, at least, existing constraints on the nuclear matter
equation of state or general relativity or both.
--
Lt. Lazio, HTML police | e-mail: jlazio@patriot.net
No means no, stop rape. | http://patriot.net/%7Ejlazio/
sci.astro FAQ at http://sciastro.astronomy.net/sci.astro.html |
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| Rob |
Posted: Sun Feb 11, 2007 2:06 pm |
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Guest
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On Feb 11, 12:19 pm, Joseph Lazio <jla...@adams.patriot.net> wrote:
Quote:
I don't see Craig's comments as summarily dismissive. He points to a
very real problem. The typical time scale for a field reversal is
many rotation periods. If pulsar pulses are due to a field reversal,
that requires the neutron star be spinning much, much faster than the
pulse period. In turn, this would require at least some pulsars to be
rotating at speeds well in excess of their break-up speed (i.e., the
speed at which the rotational velocity at the surface exceeds the
escape velocity).
If you want this idea to be remotely close to accurate, you have to
also abandon, at least, existing constraints on the nuclear matter
equation of state or general relativity or both.
Your arguments are based on an analogy between field reversals within
the Solar System and putative reversals for a pulsar. A pulsar is a
radically different system! Do you have any scientific argument that
says that a pulsar cannot reverse its field once per revolution, or
once every two revolutions? I suspect that you would be hard pressed
to come up with a convincing argument against such a possibility.
We might have to radically revise our models of pulsars, but I doubt
that we would have to "abandon" GR.
Rob |
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| Rob |
Posted: Sun Feb 11, 2007 2:12 pm |
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Guest
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On Feb 11, 6:42 am, c0h0...@hotmail.com wrote:
Have you published anything on the Magnetic Oscillation model. If so
where could I find a copy?
Thanks, Rob |
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| Craig Markwardt |
Posted: Sun Feb 11, 2007 4:43 pm |
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Guest
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"Rob" <rloldershaw@amherst.edu> writes:
Quote: On Feb 11, 12:19 pm, Joseph Lazio <jla...@adams.patriot.net> wrote:
I don't see Craig's comments as summarily dismissive. He points to a
very real problem. The typical time scale for a field reversal is
many rotation periods. If pulsar pulses are due to a field reversal,
that requires the neutron star be spinning much, much faster than the
pulse period. In turn, this would require at least some pulsars to be
rotating at speeds well in excess of their break-up speed (i.e., the
speed at which the rotational velocity at the surface exceeds the
escape velocity).
If you want this idea to be remotely close to accurate, you have to
also abandon, at least, existing constraints on the nuclear matter
equation of state or general relativity or both.
Your arguments are based on an analogy between field reversals within
the Solar System and putative reversals for a pulsar. A pulsar is a
radically different system! ...
Since the original poster was arguing by analogy with the earth and
sun, what is your point?
Quote: ... Do you have any scientific argument that
says that a pulsar cannot reverse its field once per revolution, or
once every two revolutions? I suspect that you would be hard pressed
to come up with a convincing argument against such a possibility.
The original poster arguing by analogy to the sun and earth, so it
would be up to him to argue why his "belief" would be feasible for
pulsars with millisecond periods. Also, he doesn't really explain why
the field would reverse. At one point, he claims there are superfluid
protons and electrons [*] within the neutron star which suddenly
reverse direction. At another point he claims that it has something
to do with accreting dust -- even though many pulsars are not
accreting. His is not a very coherent picture.
CM
[*] Note that there is no such thing as superfluid electrons or protons. |
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| Craig Markwardt |
Posted: Sun Feb 11, 2007 5:18 pm |
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Guest
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c0h0nes@hotmail.com writes:
Quote: On 11 Feb, 02:30, Craig Markwardt
craigm...@REMOVEcow.physics.wisc.edu> wrote:
c0h0...@hotmail.com writes:
The traditional view of pulsar radiation frequency is dependent on the
rate of rotation of the neutron star at it's centre. It seems likely
that together with other cosmic objects with magnetospheres, including
our earth and sun, that a pulsar may be subject to the same
phenomenon. I came to the conclusion a few days ago, but I am not the
first with this idea:http://www.cosis.net/abstracts/COSPAR2006/01770/
COSPAR2006-A-01770.pdf?PHPSESSID=70b66b95a0d4ed74826465a72635029c
The pulsar magnetic field oscillation model and the verification ...
This may cause researchers to rethink their theories on pulsar
structure, electrodynamics and magnetosphere structure, allowing the
rate of spin to be independent of the frequency of emissions.
I am led to believe that this magnetic field polarity reversal may
explain many of the difficulties encountered in Pulsar research.
I believe that the neutron star is made of superfluid neutrons, with a
relatively small amount of transient proton and electron superfluid
components, which vary in proportion at the same rate as the magnetic
flux reversal, creating an alternating protonic/electronic current,
and the pulsar dynamo is in effect an alternator. Plasma ions and dust
Note that this has no similarity to the solar or terrestrial magnetic
field reversal process (which is a convective "alpha-dynamo").
I note no response.
Quote:
Also note that magnetic field reversals in dynamos like the earth or
sun occur over many hundreds or thousands of rotation cycles. Thus,
one would infer from your "belief" that the actual neutron star
rotation speed would need to be much faster than the pulsation rate.
On the other hand, some pulsars pulse at rates which are within a
factor of a few of the break-up rotation speed for a neutron star (few
milliseconds). Thus, there is no realistic way to produce such
oscillations.
I note no response.
Quote:
Finally note that no plausibility has been given to explain how
magnetic field reversals would produce ultra-stable pulsations over
tens of years (with stabilities that rival atomic clocks on earth).
I note no response.
Quote:
CM
The quoted poster abstract (link split at end of line) is reproduced
below:
.... text removed for brevity ...
For instance work on superconductors in the lab has been extrapolated
to a postulated frozen magnetic field in neutron stars, which we can
usually only observe as pulsars, which are dynamic evolving energetic
systems, exchanging mass and energy in their various environments,
unlike the small scale static experiments on superconductors at low
temperature. The theory has not been falsified, but there are
observations that it may take hundreds of years for a supernova
remnant to develop an observable magnetic neutron star (NS) at its
midst, and that any frozen magnetic field must be self contained
within the star. Duh!
"Frozen" magnetic fields does not mean the magnetic field region is
totally contained with in the star. It's also worth noting that
magnetic field evolution of neutron stars (i.e. "non-frozen" fields)
have not been ruled out, and are an active topic of research.
Quote: If magnetic field is not observable, it may not exist at all. "But it
must be there!" is just another belief, not testable.
Not testable? You mean like this?
Radhakrishnan, V. & Cooke, D. J. 1969, Astrophys. Lett., 3, 225
Magnetic Poles and the Polarization Structure of Pulsar Radiation
Quote: One belief could be that the star is rotating near its maximum angular
velocity of the order of 3000Hz, and that magnetic field is disrupted
as it plows through the corotating plasma. ...
Hold on. You were just arguing against the rotational model of
pulsars, and now you are propounding it?
Quote: ... Indeed researchers are
finding it strange that the fastest pulsar has a frequency of only
715Hz, whereas speeds of up to the maximum have been postulated. This
is just one more criticism of the lighthouse theory. Most pulsars
should be spinning faster than we can observe on the basis of the
lighthouse theory.
The "lighthouse theory" doesn't predict a rotation speed for neutron
stars, so your comment is irrelevant.
Quote: In some pulsars, the frequency is not stable over time. Others have
sub-pulses and glitches, which may be analogous to solar sunspot
activity.
However, your "belief" about magnetic field oscillations must predict
a phenomenon which is stable enough to produce the most stable
pulsations observed (i.e. nearly as stable as an atomic clock). As
far as I am aware, the magnetic field reversals of the sun and earth
are at best quasi-periodic (examples, Maunder Minimum) with
quality-factors of a few tens. I.e. magnetic field reversals would be
totally unsuitable to produce ultra-stable pulsations.
Quote: If we believe that the collapsed mass in an NS conserves the angular
momentum of the progenitor star, that the magnetic field is conserved
to produce some of the strongest magnets in the universe, why not that
the reversal of magnetic field of the old star is also conserved, but
the rate increases to fit the size of the resulting NS?
I note that this is purely argument by analogy, and there is no real
physics in the question. If you really believe that neutron stars
could be rapidly rotating with high magnetic fields, then is it really
a stretch to believe that the emission could be rotationally modulated?
CM |
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| Guest |
Posted: Sun Feb 11, 2007 7:44 pm |
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On 11 Feb, 18:12, "Rob" <rlolders...@amherst.edu> wrote:
Quote: On Feb 11, 6:42 am, c0h0...@hotmail.com wrote:
Have you published anything on the Magnetic Oscillation model. If so
where could I find a copy?
Thanks, Rob
No, see initial post, I only thought about it a few days ago, and
searched around and only found the poster from Liang & Liang,
reproduced in entirety in my previous post. I hope they publish again
with any findings they may have.
I am enjoying being flamed by CM though.
It is a novel idea, and all credit to the Chinese team and seems so
obvious to investigate, as it would clarify some of the big problems
with the maths attempting to explain some of the current theories, and
some of the unfeasible proposals that have now to be discounted.
C0h0 |
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Posted: Sun Feb 11, 2007 7:51 pm |
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On 11 Feb, 20:43, Craig Markwardt
<craigm...@REMOVEcow.physics.wisc.edu> wrote:
Quote: "Rob" <rlolders...@amherst.edu> writes:
On Feb 11, 12:19 pm, Joseph Lazio <jla...@adams.patriot.net> wrote:
....content removed
[*] Note that there is no such thing as superfluid electrons or protons.
I suggest you search google and look up "Cooper pairs" |
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| Rob |
Posted: Mon Feb 12, 2007 12:14 am |
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Guest
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On Feb 11, 6:44 pm, c0h0...@hotmail.com wrote:
Quote:
It is a novel idea, and all credit to the Chinese team and seems so
obvious to investigate, as it would clarify some of the big problems
with the maths attempting to explain some of the current theories, and
some of the unfeasible proposals that have now to be discounted.
If you take an atomic nucleus and excite it to a high spin state, then
one of the ways it can lose energy and get back to the ground state is
by emitting gamma rays. It seems to me that there might be a useful
analogy here.
Rob |
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| Craig Markwardt |
Posted: Mon Feb 12, 2007 5:45 am |
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Guest
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c0h0nes@hotmail.com writes:
Quote: On 11 Feb, 20:43, Craig Markwardt
craigm...@REMOVEcow.physics.wisc.edu> wrote:
"Rob" <rlolders...@amherst.edu> writes:
On Feb 11, 12:19 pm, Joseph Lazio <jla...@adams.patriot.net> wrote:
...content removed
[*] Note that there is no such thing as superfluid electrons or protons.
I suggest you search google and look up "Cooper pairs"
I suggest you justify the presence of Cooper pairs under the
conditions that you have claimed.
CM |
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