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Quasi-periodic modulation of solar and stellar flaring emission by magnetohydrodynamic oscillations in a nearby loop

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Nakariakov, V. M. (Valery M.), Foullon, C. (Claire), Verwichte, E. (Erwin) and Young, N. P.. (2006) Quasi-periodic modulation of solar and stellar flaring emission by magnetohydrodynamic oscillations in a nearby loop. Astronomy & Astrophysics, Vol.452 (No.1). pp. 343-346. ISSN 0004-6361

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Abstract

We propose a new model for quasi-periodic modulation of solar and stellar flaring emission. Fast magnetoacoustic oscillations of a non-flaring loop can interact with a nearby flaring active region. This interaction occurs when part of the oscillation situated outside the loop reaches the regions of steep gradients in magnetic field within an active region and produces periodic variations of electric
current density. The modulation depth of these variations is a few orders of magnitude greater than the amplitude of the driving oscillation. The variations of the current can induce current-driven plasma micro-instabilities and thus anomalous resistivity. This can periodically trigger magnetic reconnection, and hence acceleration of charged particles, producing quasi-periodic pulsations of X-ray,
optical and radio emission at the arcade footpoints.

Item Type: Journal Article
Subjects: Q Science > QB Astronomy
Divisions: Faculty of Science > Physics
Library of Congress Subject Headings (LCSH): Solar flares, Solar oscillations, Solar magnetic fields, Sun -- Corona, Stellar oscillations, Stars -- Corona, Stars--Magnetic fields, Magnetohydrodynamics
Journal or Publication Title: Astronomy & Astrophysics
Publisher: EDP Sciences
ISSN: 0004-6361
Official Date: June 2006
Volume: Vol.452
Number: No.1
Page Range: pp. 343-346
Identification Number: 10.1051/0004-6361:20054608
Status: Peer Reviewed
Access rights to Published version: Open Access
Funder: Royal Society (Great Britain), Leverhulme Trust (LT), Particle Physics and Astronomy Research Council (Great Britain) (PPARC)
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URI: http://wrap.warwick.ac.uk/id/eprint/3516

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