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EP: Extraterrestrische Physik

EP 17: Sonne: Atmosph
äre

EP 17.4: Fachvortrag

Thursday, March 16, 2006, 10:00–10:15, B

3D MHD coronal models of active regions and quiet Sun — •Sven Bingert und Hardi Peter — Kiepenheuer-Institut fuer Sonnenphysik, 79104 Freiburg

The lower corona and transition region of the Sun are highly structured through the magnetic field, and are very dynamic. To account for both the structure and the dynamics, a 3D MHD model of the corona is employed, with the heating due to braiding of magnetic field lines. Based hereupon EUV emission line profiles formed in the transition region and corona are derived. This forward model approach allows us to directly compare our model results to observations.

We will present results from the 3D MHD model for a small active region and the quiet Sun. In a previous analysis we showed that the emission measure and the Doppler shifts as well as temporal fluctuations, as derived from the 3D coronal active region model, match the observations strikingly well. The next step is to concentrate on the quiet Sun, and investigate the role of the magnetic field concentrations along the boundaries of the super-granular cells outlining the chromospheric network.