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Twisting flux tubes as a cause of micro-flaring activity

Published online by Cambridge University Press:  01 September 2007

D. B. Jess ,
R. T. J. McAteer ,
M. Mathioudakis ,
F. P. Keenan ,
A. Andic  and
D. S. Bloomfield
D. B. Jess
Affiliation:
Astrophysics Research Centre, School of Mathematics and Physics, Queen's University, Belfast, BT7 1NN, Northern Ireland, UK email: djess01@qub.ac.uk NASA Goddard Space Flight Center, Solar Physics Laboratory, Code 671, Greenbelt, MD 20771, USA
R. T. J. McAteer
Affiliation:
NASA Goddard Space Flight Center, Solar Physics Laboratory, Code 671, Greenbelt, MD 20771, USA
M. Mathioudakis
Affiliation:
Astrophysics Research Centre, School of Mathematics and Physics, Queen's University, Belfast, BT7 1NN, Northern Ireland, UK email: djess01@qub.ac.uk
F. P. Keenan
Affiliation:
Astrophysics Research Centre, School of Mathematics and Physics, Queen's University, Belfast, BT7 1NN, Northern Ireland, UK email: djess01@qub.ac.uk
A. Andic
Affiliation:
Astrophysics Research Centre, School of Mathematics and Physics, Queen's University, Belfast, BT7 1NN, Northern Ireland, UK email: djess01@qub.ac.uk
D. S. Bloomfield
Affiliation:
Max-Planck-Institut für Sonnensystemforschung, Max-Planck-Str. 2, 37191 Katlenburg-Lindau, Germany
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Abstract

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High-cadence optical observations of an H-α blue-wing bright point near solar AR NOAA 10794 are presented. The data were obtained with the Dunn Solar Telescope at the National Solar Observatory/Sacramento Peak using a newly developed camera system, the rapid dual imager. Wavelet analysis is undertaken to search for intensity-related oscillatory signatures, and periodicities ranging from 15 to 370 s are found with significance levels exceeding 95%. During two separate microflaring events, oscillation sites surrounding the bright point are observed to twist. We relate the twisting of the oscillation sites to the twisting of physical flux tubes, thus giving rise to reconnection phenomena. We derive an average twist velocity of 8.1 km/s and detect a peak in the emitted flux between twist angles of 180° and 230°.

Keywords

Sun: activitySun: atmospheric motionsSun: evolutionSun: flaresSun: oscillationsSun: photosphere
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 3 , Symposium S247: Waves & Oscillations in the Solar Atmosphere: Heating and Magneto-Seismology , September 2007 , pp. 360 - 363
Copyright
Copyright © International Astronomical Union 2008

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