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

Valery Nakariakov   Submitted: 2006-02-24 07:26

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 produce 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.

Authors: V.M. Nakariakov, C. Foullon, E. Verwichte, N.P. Young
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Publication Status: A&A (in press)
Last Modified: 2006-02-24 07:29
Go to main E-Print page  Oscillations of hard X-ray flare emission observed by RHESSI  Large amplitude oscillation of a polar crown filament in the pre-eruption phase  Edit Entry  Download Preprint  Submitter's Homepage Delete Entry 

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