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A&A Supplement series, Vol. 122, May I 1997, 585-592

Received April 2; accepted July 31, 1996

An adaptive grid code for high resolution 1-D hydrodynamics of the solar and stellar transition region and corona

R. Bettatex2html_wrap1121 - G. Perestex2html_wrap1123 - F. Realetex2html_wrap1125 - S. Seriotex2html_wrap1127

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tex2html_wrap1129  Istituto e Osservatorio Astronomico di Palermo, Palazzo dei Normanni, I-90134 Palermo, Italy
tex2html_wrap1131  Istituto per le Applicazioni Interdisciplinari della Fisica/CNR, Via Archirafi 36, I-90123 Palermo, Italy


We present a new version of the Palermo-Harvard hydrodynamic model of plasma confined in coronal loops, based on a regridding algorithm which ensures limited variations of thermodynamical variables across grid points. The code provides an accurate description of the dynamics of the chromosphere-corona transition region, in spite of the very steep temperature and density gradients, even during flare-like transients.

The new model can be used to synthesize, together with X-ray emission, the optically thin emission originating from the transition region, mainly in the EUV band. Here we show sample results.

keywords: methods numerical -- hydrodynamics -- Sun: transition region -- Sun: corona -- Sun: flares -- Sun: UV radiation

Copyright by the European Southern Observatory (ESO)