Time-Distance analysis of the Emerging Active Region NOAA 10790

Details Time-Distance analysis of the Emerging Active Region NOAA 10790 Time-Distance analysis of the Emerging Active Region NOAA 10790

2008-07-18

arxiv.org/abs/0807.3000v1

Astronomy and Astrophysics

Astrophysics

12 pages, 6 figures, accepted Solar Physics

Scientific paper

10.1007/s11207-008-9239-z

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 $1 {\rm km s^{-1}}$.

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