Temporal Evolution of Physical Parameters in Granule

J. Koza (2), L.R. Bellot Rubio (3), A. Hanslmeier (1), A. Kucera (2), J. Rybák (2), H. Wöhl (3)

1 - Institut for Geophysics, Astrophysics and Meteorology, Universitätsplatz 5, A-8010 Graz, Austria
2 - Astronomical Institute, Slovak Academy of Sciences, SK-05960 Tatranská Lomnica, Slovakia
3 - Kiepenheuer-Institute für Sonnenphysik, Schöneckstr. 6, D-79104 Freiburg, Germany

The temporal evolution of the physical parameters inside a granule is presented. This is a step towards a more realistic 1D modeling of the solar granulation, avoiding the temporal averaging used up to now. The granulation is treated as a dynamical phenomenon and our model has been calculated using an inversion method applied to time series of spectra. The granular evolutionary model is presented in the form of the functional dependence of temperature T(log(tau), t) and line-of-sight velocity v(LOS)(log(tau), t) on optical depth tau and time t. The observed disappearance of the granule is accompanied with significant temperature changes greater than app.300 K in deeper layers (log(tau)>0) and upper layers (log(tau)<-2.5). In contrary, the layers from log(tau) ~ -0.5 to log(tau) ~ -1.5 are more stable in the sense of temperature variations, which are less then app. 150 K. An oscillatory behavior is found in the line-of-sight velocity stratification from log(tau) ~ 0 upwards with increasing amplitude reaching up to app. 2 km/s in upper layers.

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