Excitation of solar p modes. Effect of the asymmetry of the convection zone

Details Excitation of solar p modes. Effect of the asymmetry of the convection zone Excitation of solar p modes. Effect of the asymmetry of the convection zone

Jun 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006sf2a.conf..523b&link_type=abstract

SF2A-2006: Proceedings of the Annual meeting of the French Society of Astronomy and Astrophysics Eds.: D. Barret, F. Casoli, G.

Astronomy and Astrophysics

Astrophysics

Scientific paper

Excitation of stellar p modes by turbulent convection is investigated. The aim is to take into account the asymmetry of up- and downflows created by turbulent plumes through an adapted closure model. We built a generalized two scale mass flux model (GTFM) that includes both the skew introduced by the presence of two flows and the effect of turbulence within each flow. The plume dynamics modelled according to Rieutord & Zahn (1995) is used to construct a closure model with plumes (CMP). We apply it to the formalism of excitation of stellar p modes developed by Samadi & Goupil (2001). The new excitation model leads to a frequency dependence, of the power supplied to solar p modes, which is in agreement with GOLF observations. Despite an increase of the Reynolds stress contribution due to our improved description, an additional source of excitation -identified as the entropy source term- is still necessary to reproduce the maximum of excitation rate. Our modelling including the entropy contribution reproduces the maximum but
over-estimates, at low frequencies, the power and calls for further theoretical improvements.

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