Magnetic Fields of Neutron Stars

In summary: They are basically neutron stars that have lost all their hydrogen, and are composed almost entirely of iron and nickel. They have incredibly strong magnetic fields, as do neutron stars in general, but what makes a Magnestar different is that their magnetic fields are constantly changing, and can be quite erratic.
  • #1
Nebula
46
0
It is a known fact that neutron stars and pulsars, remnants of super nova explosions, have very strong magnetic fields. It is said that the collapse of the core amplifies the magnetic field of the progenitor. This is due to the fact that the magnetic fields lines are drawn closer together during the collapse by the contracting material. The magnetic fields of neutron stars and pulsars are millions, even trillions of times stronger than the Earth’s magnetic field. The current http://www.physicspost.com/imageview.php?imageId=34 [Broken] model for a pulsar describes two hotspots on the surface of the star that lie along the magnetic axis generating beams of out going radiation that produce the characteristic pulses of these stars.

How is it that the magnetic field of these stars is able to retain its stability for so long if the star is essentially made up of neutral matter (neutrons)? My current speculation is that there must be some sort of other particle mediating the electromagnetic force within the neutron stars, perhaps the W or Z boson; which are weak nuclear force carriers that are produced in various nuclear processes such as beta decay. Moving charge, variable electric fields and other phenomena can generate magnetic fields, but neutrons alone cannot generate these fields unless something else is going on or there are other particles involved. How are the high magnetic fields of neutron stars and pulsars sustained?
 
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  • #2
Originally posted by Nebula
It is a known fact that neutron stars and pulsars, remnants of super nova explosions, have very strong magnetic fields. It is said that the collapse of the core amplifies the magnetic field of the progenitor. This is due to the fact that the magnetic fields lines are drawn closer together during the collapse by the contracting material. The magnetic fields of neutron stars and pulsars are millions, even trillions of times stronger than the Earth’s magnetic field. The current http://www.physicspost.com/imageview.php?imageId=34 [Broken] model for a pulsar describes two hotspots on the surface of the star that lie along the magnetic axis generating beams of out going radiation that produce the characteristic pulses of these stars.

How is it that the magnetic field of these stars is able to retain its stability for so long if the star is essentially made up of neutral matter (neutrons)? My current speculation is that there must be some sort of other particle mediating the electromagnetic force within the neutron stars, perhaps the W or Z boson; which are weak nuclear force carriers that are produced in various nuclear processes such as beta decay. Moving charge, variable electric fields and other phenomena can generate magnetic fields, but neutrons alone cannot generate these fields unless something else is going on or there are other particles involved. How are the high magnetic fields of neutron stars and pulsars sustained?
Because Neutron stars are not of a consistant structure or uniformity throughout. See the info at:

http://www.astro.umd.edu/~miller/nstar.html#formation
It explains at several places on the page the workings of a neutron star that give rise to the huge magnetic fields.
 
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  • #3
Thanks for the link Labguy. So essentially a neutron star isn’t made up entirely of neutrons. I completely overlooked the fact that the star might have various stratified layers particularly the “atmosphere” consisting primarily of iron nuclei. Thanks again for the info. :smile:
 
  • #4
Nebula-

Try also Scientific American February 2003, "Magnetars," page 34. I believe the maintenance of the magnetic field is due to quantum-statistical Fermi-Dirac effects as well as the rate of spin of that neutron star. The latter I liken to blue giants (magnetars) burning out more rapidly than white dwarves (conventional pulsar). The greater the spin and thus field, the shorter its duration.
 
  • #5
Uhmm, and

It should also be noted that neutrons are known to have their own magnetic field, small, exceedingly small, but it is there.

Coalesence, and amplification, could easily lead to this being an aspect of the entire magnetic fields strength, and origin.

After all, a neutrons composition is a positron (positive) and an electron (negative) within, what had been a proton, and those are the two energies of magnets. (when contained within one object)
 
  • #6
What is the neutron vs proton electric moment numerically? Exceedingly small?
 
  • #7
What you are asking about, and talking about is a Magnestar, do a search for them, they are a fringe topic and don't get a lot of coverage.
 

1. What is a neutron star?

A neutron star is a type of celestial object that is created when a massive star dies in a supernova explosion. It is incredibly dense, with a mass of about 1.4 times that of the sun packed into a sphere with a diameter of only about 10 kilometers.

2. How are magnetic fields formed in neutron stars?

The magnetic fields in neutron stars are thought to be formed during the supernova explosion that creates them. As the star's core collapses, the magnetic field lines are compressed and become stronger.

3. How strong are the magnetic fields on neutron stars?

The magnetic fields on neutron stars are some of the most powerful in the universe, with the strongest ones measuring in at about 10^15 Gauss. This is about a trillion times stronger than the Earth's magnetic field.

4. What are the effects of these strong magnetic fields on neutron stars?

The magnetic fields of neutron stars can have a variety of effects. They can cause the star's rotation to slow down over time, emit powerful beams of radiation, and influence the behavior of matter in their surroundings.

5. How do scientists study the magnetic fields of neutron stars?

Scientists use a variety of methods to study the magnetic fields of neutron stars. These include observing their effects on the behavior of matter and radiation, studying the pulsations of the star's surface, and using specialized instruments to directly measure the strength of the magnetic field.

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