Hinode EUV spectroscopic observations of coronal oscillations

Erdelyi, R. and Taroyan, Y. (2008) Hinode EUV spectroscopic observations of coronal oscillations. Astronomy & Astrophysics, 489 (3). L49-L52. ISSN 1432-0746

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Abstract

Context. Waves offer a unique opportunity to understand and diagnose the properties of the solar coronal plasma. Aims. Hinode/EIS observations are analysed to detect wave and oscillatory motions in the solar corona. Methods. The EIS observations were carried out using a selection of EUV lines. Hinode/XRT images are taken concurrently. Results. Two examples of oscillations in active regions are presented. We analysed the evolution of the intensities and Doppler shifts. The Hinode/XRT images suggest that both events occurred along loop-like structures. The first event is interpreted as a slow sausage (acoustic) type wave with a period of 1.2 mHz. The second example is associated with a transverse, most likely kink type, wave with a period of 3 mHz. The EUV line ratios were then used to determine the value of the coronal magnetic field.

Item Type:	Article
Copyright, Publisher and Additional Information:	© 2008 EDP Sciences. Reproduced in accordance with the publisher's self-archiving policy.
Academic Units:	The University of Sheffield > Faculty of Science (Sheffield) > School of Mathematics and Statistics (Sheffield)
Depositing User:	Mrs Megan Hobbs
Date Deposited:	16 Mar 2010 18:56
Last Modified:	08 Feb 2013 17:00
Published Version:	http://dx.doi.org/10.1051/0004-6361:200810263
Status:	Published
Publisher:	EDP Sciences
Refereed:	Yes
Identification Number:	10.1051/0004-6361:200810263
URI:	http://eprints.whiterose.ac.uk/id/eprint/10527

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