Time evolution of physical parameters in granule

Details Time evolution of physical parameters in granule Time evolution of physical parameters in granule

Oct 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002esasp.505..457k&link_type=abstract

In: SOLMAG 2002. Proceedings of the Magnetic Coupling of the Solar Atmosphere Euroconference and IAU Colloquium 188, 11 - 15 Jun

Physics

1

Sun: Granulation, Sun: Photosphere, Stars: Atmospheres, Line: Profiles

Scientific paper

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 τ, t) and line-of-sight velocity vLOS(log τ, t) on optical depth τ and time t. The observed disappearance of the granule is accompanied with significant temperature changes greater than ~300K in deeper layers (log τ5 > 0) and upper layers (log τ5 < -2.5). In contrary, the layers from log τ5 ~= -0.5 to log τ5 ~= -1.5 are more stable in the sense of temperature variations, which are less than ~150K. An oscillatory behavior is found in the line-of-sight velocity stratification from log τ5 ~= 0 upwards with increasing amplitude reaching up to ~= 2 km s-1 in upper layers.

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