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Generation of highly energetic electrons at reconnection outflow shocks during solar flares View all abstracts by submitter

Alexander Warmuth   Submitted: 2008-10-01 08:33

Context: During solar flares a large amount of energy is suddenly released and partly transfered into energetic electrons. They are of special interest since a substantial part of the energy released during a flare is deposited into the energetic electrons. RHESSI observations, e.g. of the solar event on October 28, 2003, show that 1036 electrons with energies > 20 keV are typically produced per second during large flares. They are related to a power of about 1022 W. It is a still open question in which way so much electrons are acclerated up to high energies during a fraction of a second. Aims: Within the framework of the magnetic reconnection scenario, jets appear in the outflow region and can establish standing fast-mode shocks if they penetrate with a super-Alfvénic speed into the surrounding plasma. It is the aim to show that this shock can be the source of the energetic electrons produced during flares. Methods: The electrons are regarded to be energized by shock drift acceleration. The process is necessarily treated in a fully relativistic manner. The resulting distribution function of accelerated electrons is a loss-cone one and allows to calculated the differential electron flux, which can be compared with RHESSI observations. Results. The theoretically obtained fluxes of energetic electrons agree with the observed ones as demonstrated for the solar event on October 28, 2003. Conclusions: The shock appearing in the outflow region of the reconnection site is able to produce energetic electrons. Their fluxes are in agreement with RHESSI observations.

Authors: G. Mann, A. Warmuth, H. Aurass

Publication Status: A&A, accepted
Last Modified: 2008-10-01 09:47
Go to main E-Print page  Modelling shock drift acceleration of electrons at the reconnection outflow termination shock in solar flares. Observational constraints and parametric study  Dynamics of plasmoids formed by the current sheet tearing  Edit Entry  Download Preprint  Submitter's Homepage Delete Entry 

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