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
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.
|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|