Kumssa, Gemechu Muleta (2013) Magnetic Dipole-Quadrupole Interaction Field of Neutron Star. Masters thesis, Addis Ababa University.
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PDF (Magnetic Dipole-Quadrupole Interaction Field of Neutron Star)
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Abstract
Pulsurs are fast spinning (∼ 104 Hz) and highly magnetized (1013−14G) neutron stars(NSs), compact objects (R ∼ 10 km; ρ ∼ 1013−14g=cm3) resulting from supernova explosions that normally occur at the ends of the lives of massive stars.Measurements of electromagnetic emission related to curvature radiation from known pulsurs such as Crab or Vela pulsur strongly indicate that the magnetic field structure near the surface of these objects siginificantly differ from the customarily expected pure star centered dipole structure.Scientists now believe that possible non-dipolar components in the magnetic field structure will resolve this long time issue.The structure of magnetic field lines also defines the type and geometry of accretion discs around neutron star in binaries.In this thesis we have determined the geometry of the combined dipole and quadrupole magnetic field lines. In idealized situations the field lines near these compact objects are closed; but they may be open at large distances due to interactions with magnetic fields or stress energy from other sources such as the accretion discs, for example.The method we used is simulating field line with matlab.The result shows the field lines are open at a given distance from the surface of the star (at rmax) and it has only one solution of r(θ) for a specific angle in one quadrant.There are three neutral lines for r(θ) and the field line is more bulged than the pure dipole and quadrupole.
| Item Type: | Thesis (Masters) |
|---|---|
| Subjects: | Q Science > Q Science (General) Q Science > QC Physics |
| Divisions: | Africana |
| Depositing User: | Selom Ghislain |
| Date Deposited: | 12 Jul 2018 11:16 |
| Last Modified: | 12 Jul 2018 11:16 |
| URI: | http://thesisbank.jhia.ac.ke/id/eprint/7418 |
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