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Title:
Magnetic flares near accreting black holes
Authors:
Volwerk, M.; van Oss, R. F.; Kuijpers, J.
Affiliation:
AA(Utrecht State Univ.; CHEAF, Amsterdam, Netherlands), AB(Utrecht State Univ.; CHEAF, Amsterdam, Netherlands), AC(Utrecht State Univ.; CHEAF, Amsterdam; Nijmegen Catholic Univ., Netherlands)
Publication:
Astronomy and Astrophysics (ISSN 0004-6361), vol. 270, no. 1-2, p. 265-274. (A&A Homepage)
Publication Date:
03/1993
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
ACCRETION DISKS, BLACK HOLES (ASTRONOMY), MAGNETIC FIELD RECONNECTION, STELLAR FLARES, ELECTROMOTIVE FORCES, FORCE-FREE MAGNETIC FIELDS
Bibliographic Code:
1993A&A...270..265V

Abstract

The present treatment of magnetic flaring interactions between a black hole and an ionized accretion disk assumes that magnetic fields created in the disk, and extending into a force-free corona, will be transported onto the black hole time-horizon by the accreting plasma; magnetic links between disk and horizon would then occur. An equilibrium condition on the field structure of the connection is found not to be generally satisfied. It is concluded that these magnetic connections will release their free energy during flares, and that the form this can take, as a sequence of magnetic explosions, can be a measurable fraction of disk luminosity for stellar-mass black hole candidates.

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