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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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Official URL: http://dx.doi.org/10.1051/0004-6361:20054608

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

Dates:

Date	Event
June 2006	Published

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)

References:

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