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Electric current diagnostics in the magnetosphere of neutron stars

Published online by Cambridge University Press:  20 March 2013

Alexander V. Stepanov  and
Valery V. Zaitsev
Alexander V. Stepanov
Affiliation:
Pulkovo Observatory, Pulkovo chaussee 65, Saint Petersburg 196140, Russia email: stepanov@gao.spb.ru
Valery V. Zaitsev
Affiliation:
Institute of Applied Physics, Ulianova str. 46, Nizhny Novgorod 603950, Russia email: za130@appl.sci-nnov.ru
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Abstract

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Active neutron stars – SGRs, reveal the high-quality QPOs at the ‘pulsating tail’ phase. We suggest diagnostics of the trapped fireball plasma, the source of high-frequency pulsations, using coronal seismology. The trapped fireball is represented as a set of current-carrying loops - equivalent of electric circuits. Our approach gives the following magnetosphere parameters in SGRs: an electric current of (2−8) × 1019 A, magnetic field of (0.6−2.7) × 1013 G, and electrons density of (1.3−6.0) × 1016 cm−3. We show high-frequency QPOs can be self-excited for a smaller electric current than the maximum current and/or due to the parametric resonance.

Keywords

Stars: neutronSGRsflaresoscillationscurrent-carrying loopsdiagnostics
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 8 , Symposium S291: Neutron Stars and Pulsars: Challenges and Opportunities after 80 years , August 2012 , pp. 505 - 507
Copyright
Copyright © International Astronomical Union 2013

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