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EP: Fachverband Extraterrestrische Physik

EP 8: Sun II

EP 8.2: Talk

Wednesday, April 1, 2009, 11:40–11:55, Zahnklinik

HINODE: Simulation of observed local coronal heating events — •Jörg Büchner and Jean Santos — Max-Planck-Institut für Sonnensystemforschung, Max-Planck-Str.2, 37191, Katlenburg-Lindau, Germany

The HINODE spacecraft mission provides unprecedented observations which, in principle, allow a deeper than ever insight into the physics of the coupling between photosphere, chromosphere and corona of the Sun. However, since important elements of the coupling processes (like the magnetic field above the photoshere) are not directly observable, theoretical and modelling approaches have to be applied to obtain a maximum of information from HINODE. The non-local and non-linear character of the coupling requires a numerical treatment of its models.

For this sake we developed a computer code that takes into account the complex structure of the coronal magnetic field in its relation to the photospheric sources, the inhomogeneity of the strongly structured plasma including the transition region and the coupling of ions to the neutral atoms of the chromosphere.

Using this code we investigated the local energization of the transition region and corona of the quiet Sun observed by Hinode.

We found the location of primary heating and that, due to the changing plasma conditions, a transition takes place between DC current heating in the chromosphere and 3D magnetic reconnection in the lower corona.