Bonn 2010 – scientific programme

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EP: Fachverband Extraterrestrische Physik

EP 16: Sun II

EP 16.7: Talk

Friday, March 19, 2010, 10:15–10:30, AKM

Generation of energetic protons during solar flares — •Gottfried Mann — Astrophysikalisches Institut Potsdam, An der Sternwarte 16, D-14462 Potsdam, Germany

Huge flares are associated with the emission of gamma-ray lines indicating the generation of energetic protons during flares. In the framework of the reconnection scenario of solar flares, jets of hot plasma shoot away from the reconnection region due to the relaxation of the new magnetic field configuration. If the jet velocity exceeds the local Alfvén speed, a standing shock wave, so-called termination shock TS), can be established in the flare region. Such TS is able to accelerate both electrons and protons via the shock-drift acceleration (SDA). A fully relativistic study of SDA at the TS confirms that this mechanism is able to accelerate protons up to few tens of GeV under flaring conditions in the solar corona. This model implies different locations for electron and proton acceleration at the TS. That can explain the separation of the hard X- and gamma-ray sources as really seen by RHESSI imaging observations.