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A solar tornado caused by flares

Published online by Cambridge University Press:  06 January 2014

N. K. Panesar ,
D. E. Innes ,
S. K. Tiwari  and
B. C. Low
N. K. Panesar
Affiliation:
Max-Planck Institut für Sonnensystemforschung, Max-Planck-Str. 2, 37191, Katlenburg-Lindau email: panesar@mps.mpg.de, innes@mps.mpg.de, tiwari@mps.mpg.de Institut für Astrophysik, Georg-August-Universität Göttingen, Friedrich-Hund-Platz 1, D-37077Göttingen
D. E. Innes
Affiliation:
Max-Planck Institut für Sonnensystemforschung, Max-Planck-Str. 2, 37191, Katlenburg-Lindau email: panesar@mps.mpg.de, innes@mps.mpg.de, tiwari@mps.mpg.de
S. K. Tiwari
Affiliation:
Max-Planck Institut für Sonnensystemforschung, Max-Planck-Str. 2, 37191, Katlenburg-Lindau email: panesar@mps.mpg.de, innes@mps.mpg.de, tiwari@mps.mpg.de
B. C. Low
Affiliation:
High Altitude Observatory, National Center for Atmospheric Research, P.O. Box 3000, Boulder, CO 80307, USA email: low@ucar.edu
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Abstract

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An enormous solar tornado was observed by SDO/AIA on 25 September 2011. It was mainly associated with a quiescent prominence with an overlying coronal cavity. We investigate the triggering mechanism of the solar tornado by using the data from two instruments: SDO/AIA and STEREO-A/EUVI, covering the Sun from two directions. The tornado appeared near to the active region NOAA 11303 that produced three flares. The flares directly influenced the prominence-cavity system. The release of free magnetic energy from the active region by flares resulted in the contraction of the active region field. The cavity, owing to its superior magnetic pressure, expanded to fill this vacated space in the corona. We propose that the tornado developed on the top of the prominence due to the expansion of the prominence-cavity system.

Keywords

Sunprominencescavitycorona and flares
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 8 , Symposium S300: Nature of Prominences and their role in Space Weather , June 2013 , pp. 235 - 238
Copyright
Copyright © International Astronomical Union 2013 

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