München 2019 – wissenschaftliches Programm
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SYPA: Symposium Plasma-based Particle Accelerators
SYPA 1: Sympsium Plasma-based Particle Accelerators 1
SYPA 1.4: Hauptvortrag
Mittwoch, 20. März 2019, 15:30–16:00, Plenarsaal
Solar energetic electron events: Trying to understand the role of the shock — •Nina Dresing1, Max Bruedern1, Raúl Gómez-Herrero2, Bernd Heber1, Andreas Klassen1, Manuela Temmer3, Solveig Theesen1, and Astrid Veronig3 — 1University of Kiel, Geramy — 2SRG, University of Alcalá, Alcalá de Henares, Spain — 3University of Graz, Austria
Solar energetic particles (SEPs) are believed to be accelerated either within strong magnetic re-connection areas at the Sun, so-called solar flares, or at shock fronts which may be driven by fast coronal mass ejections (CMEs). A specific class of events are the so-called widespread SEP events, where the energetic particles can be observed up to all around the Sun by multiple spacecraft at the same time. For these events an extended shock front is often favored to explain the extraordinarily wide particle distributions. However, in-situ observations of shocks at Earth's orbit reveal nearly no efficiency in accelerating electrons to energies of about 100 keV and more, typical for SEP events. We will show multi-spacecraft observations of the two STEREO and close-to-Earth observatories combining remote-sensing and in-situ measurements. We especially use energetic particle anisotropy observations to disentangle injection and transport effects to shed some light on the role of CME-driven shocks for the electron acceleration and their wide longitudinal distribution in the inner heliopshere.