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Time-distance analysis of the emerging active region NOAA 10790

Thompson, M.J. and Zharkov, S. (2008) Time-distance analysis of the emerging active region NOAA 10790. Solar Physics, 251 (1-2). pp. 369-380. ISSN 1573-093X

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We investigate the emergence of Active Region NOAA 10790 by means of time – distance helioseismology. Shallow regions of increased sound speed at the location of increased magnetic activity are observed, with regions becoming deeper at the locations of sunspot pores. We also see a long-lasting region of decreased sound speed located underneath the region of the flux emergence, possibly relating to a temperature perturbation due to magnetic quenching of eddy diffusivity, or to a dense flux tube. We detect and track an object in the subsurface layers of the Sun characterised by increased sound speed which could be related to emerging magnetic-flux and thus obtain a provisional estimate of the speed of emergence of around 1 km s−1.

Item Type: Article
Copyright, Publisher and Additional Information: © Springer Science+Business Media B.V. 2008. This is an author produced version of a paper published in 'Solar Physics.' 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: 09 Mar 2010 14:47
Last Modified: 16 Nov 2015 22:20
Published Version: http://dx.doi.org/10.1007/s11207-008-9239-z
Status: Published
Publisher: Springer
Refereed: Yes
Identification Number: 10.1007/s11207-008-9239-z
Related URLs:
URI: http://eprints.whiterose.ac.uk/id/eprint/10478

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