Dynamical processes in the subsurface layers of the Sun

Details Dynamical processes in the subsurface layers of the Sun Dynamical processes in the subsurface layers of the Sun

Jul 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007sf2a.conf..582l&link_type=abstract

SF2A-2007: Proceedings of the Annual meeting of the French Society of Astronomy and Astrophysics held in Grenoble, France, July

Astronomy and Astrophysics

Astrophysics

Scientific paper

Recent results obtained by Lefebvre and Kosovichev (2005) using f-modes frequencies from SOHO/MDI, indicate a change in the stratification of the subsurface layers, more precisely a non-homogeneous variation of these layers with depth and time. To progress on this transition zone between the solar interior and the external part, we begin to analyse the problem from a theoretical point of view. Using the CESAM code, we show how a small variation in the radius implies a variation in the subsurface structure. We use the theoretical f-modes frequencies to examine the corresponding changes in the stratification. Furthermore, we discuss the related physics, very complex in this zone, and show the variations of the temperature gradients, the density and pressure scale heights caused by the change in radius.

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