München 2019 – wissenschaftliches Programm

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EP: Fachverband Extraterrestrische Physik

EP 1: Sun and Heliosphere I

EP 1.3: Vortrag

Montag, 18. März 2019, 17:15–17:30, HS 19

Constraining energy release and transport processes in solar flares with X-ray and bolometric observations — •Alexander Warmuth and Gottfried Mann — Leibniz-Institut für Astrophysik Potsdam (AIP), An der Sternwarte 16, 14482 Potsdam

Energy release and transport processes in solar flares are constrained by means of a comprehensive characterization of the physical parameters of both the thermal plasma and the accelerated nonthermal electrons, using X-ray observations from RHESSI and GOES. This is complemented by bolometric radiated energies as measured by SORCE and SOHO/VIRGO. We find evidence for two plasma components: a cooler component (10-20 MK) evaporated from the chromosphere, and an additional hotter component (>20 MK) which is more consistent with direct in-situ heating of coronal plasma. The potentially very significant role of conductive energy losses is investigated. Finally, the relative contribution of electron acceleration versus direct heating (i.e., the acceleration efficiency) is studied as a function of flare importance.