Freiburg 2008 – scientific programme

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EP: Fachverband Extraterrestrische Physik

EP 8: The Sun and Heliosphere II

EP 8.1: Talk

Tuesday, March 4, 2008, 16:45–17:00, KGI-Aula

Electron acceleration by DC electric fields during solar flares — •Gottfried Mann and Hakan Önel — Astrophysikalisches Institut Potsdam, An der Sternwarte 16, D-14482 Potsdam

During solar flares a huge amount of energy is suddenly released in the solar corona. They are accompanied by an enhanced emission of energetic particles and broadband electronmagnetic radiation from the radio up to the hard X-ray range. A large amount of the flare released energy is deposited into the energetic electrons. It is still not fully understood in which way electrons are accelerated up to high energies within a fraction of seconds. Here, we present a flare model in terms of an electric circuit located in the photosphere and corona. The circuit is driven by the photospheric plasma motion. The electrons are accelerated by the DC electric field appearing in coronal loops while the circuit is closed via the corona.