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. Betta - G. Peres - F. Reale - S. Serio

Send offprint request: betta@oapa.astropa.unipa.it

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

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.

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

 
• 1. Introduction
• 2. The numerical scheme
• 3. Hydrodynamic simulations
• 4. Synthesis of the observables
• 5. Discussion and conclusions
• References