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Alfven Waves in the Lower Solar Atmosphere

Jess, D.B., Mathioudakis, M., Erdelyi, R., Crockett, P.J., Keenan, F.P. and Christian, D.J. (2009) Alfven Waves in the Lower Solar Atmosphere. Science, 323 (5921). pp. 1582-1585. ISSN 1095-9203

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We report the detection of oscillatory phenomena associated with a large bright-point group that is 430,000 square kilometers in area and located near the solar disk center. Wavelet analysis reveals full-width half-maximum oscillations with periodicities ranging from 126 to 700 seconds originating above the bright point and significance levels exceeding 99%. These oscillations, 2.6 kilometers per second in amplitude, are coupled with chromospheric line-of-sight Doppler velocities with an average blue shift of 23 kilometers per second. A lack of cospatial intensity oscillations and transversal displacements rules out the presence of magneto-acoustic wave modes. The oscillations are a signature of Alfven waves produced by a torsional twist of +/-22 degrees. A phase shift of 180 degrees across the diameter of the bright point suggests that these torsional Alfven oscillations are induced globally throughout the entire brightening. The energy flux associated with this wave mode is sufficient to heat the solar corona.

Item Type: Article
Copyright, Publisher and Additional Information: © 2009 American Association for the Advancement of Science. This is an author produced version of a paper published in 'Science'. Uploaded in accordance with the publisher's self-archiving policy.
Institution: The University of Sheffield
Academic Units: The University of Sheffield > Faculty of Science (Sheffield) > School of Mathematics and Statistics (Sheffield)
Depositing User: Mrs Megan Hobbs
Date Deposited: 12 Mar 2010 15:24
Last Modified: 23 Nov 2015 21:25
Published Version: http://dx.doi.org/10.1126/science.1168680
Status: Published
Publisher: American Association for the Advancement of Science
Identification Number: 10.1126/science.1168680
Related URLs:
URI: http://eprints.whiterose.ac.uk/id/eprint/10536

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