Magnetic Dipole-Quadrupole Interaction field of Neutron Star
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Date
2013-06
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Addis Ababa University
Abstract
Pulsurs are fast spinning ( 104 Hz) and highly magnetized (101314G) neutron
stars(NSs), compact objects (R 10 km; 101314g=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 mag-
netic eld structure near the surface of these objects sigini cantly di er from the
customarily expected pure star centered dipole structure.Scientists now believe
that possible non-dipolar components in the magnetic eld structure will resolve
this long time issue.The structure of magnetic eld lines also de nes 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 eld
lines. In idealized situations the eld lines near these compact objects are closed;
but they may be open at large distances due to interactions with magnetic elds
or stress energy from other sources such as the accretion discs, for example.The
method we used is simulating eld line with matlab.The result shows the eld
lines are open at a given distance from the surface of the star (at rmax) and it
has only one solution of r( ) for a speci c angle in one quadrant.There are three
neutral lines for r( ) and the eld line is more bulged than the pure dipole and
quadrupole
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Magnetic Dipole-Quadrupole