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

¹ Istituto e Osservatorio Astronomico di Palermo, Palazzo dei Normanni, I-90134 Palermo, Italy
² Istituto per le Applicazioni Interdisciplinari della Fisica/CNR, Via Archirafi 36, I-90123 Palermo, Italy

Received: 2 April 1996
Accepted: 31 July 1996

Abstract

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.