Journal
SOLAR PHYSICS
Volume 251, Issue 1-2, Pages 369-380Publisher
SPRINGER
DOI: 10.1007/s11207-008-9239-z
Keywords
sun : Active Region emergence; sun : time-distance helioseismology
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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).
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