Ballooning Instability in Coronal Flare Loops

Details Ballooning Instability in Coronal Flare Loops Ballooning Instability in Coronal Flare Loops

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008soph..253..161t&link_type=abstract

Solar Physics, Volume 253, Issue 1-2, pp. 161-172

Physics

5

Flares, Waves, Instability, Radio Emission

Scientific paper

Within the framework of ideal magnetohydrodynamics the excitation of the ballooning instability in a toroidal coronal loop with a radius of cross section a and a radius of curvature R is analyzed by using the energy method. Kink oscillations are able to excite the ballooning instability when the plasma beta parameter β>2 a/ R. It has been suggested that this can result in the formation of cusp-shaped coronal loops. Modulation of gyrosynchrotron emission caused by kink oscillations is considered. The intensity of gyrosynchrotron emission for optically thin sources is the most sensitive to Alfvén disturbances. The obtained theoretical results are discussed in the light of Yohkoh, SOHO, TRACE, RHESSI, and Nobeyama observations.

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