2015A&A...573A..51B -
Astronomy and Astrophysics, volume 573A, 51-51 (2015/1-1)
General solution for the vacuum electromagnetic field in the surroundings of a rotating star.
BONAZZOLA S., MOTTEZ F. and HEYVAERTS J.
Abstract (from CDS):
Many recent observations of pulsars and magnetars can be interpreted in terms of neutron stars with multipole electromagnetic fields. As a first approximation, we investigate the multipole magnetic and electric fields in the environment of a rotating star when this environment is deprived of plasma. We compute a multipole expansion of the electromagnetic field in vacuum for a given magnetic field on the conducting surface of the rotating star. Then, we consider a few consequences of multipole fields of pulsars. We provide an explicit form of the solution. For each spherical harmonic of the magnetic field, the expansion contains a finite number of terms. A multipole magnetic field can provide an explanation for the stable sub-structures of pulses, and they offer a solution to the problem of current closure in pulsar magnetospheres. This computation generalises the widely used model of a rotating star in vacuum with a dipole field. It can be especially useful as a first approximation to the electromagnetic environment of a compact star, for instance a neutron star, with an arbitrarily magnetic field.
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Journal keyword(s):
pulsars: general - stars: magnetars - stars: magnetic field
Simbad objects:
8
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