Würzburg 2018 – wissenschaftliches Programm
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EP: Fachverband Extraterrestrische Physik
EP 11: Sun and Heliosphere III - Particles
EP 11.5: Vortrag
Donnerstag, 22. März 2018, 16:15–16:30, BSZ - Pabel HS
Transport modeling of supra-thermal electrons in the 20 October 2002 solar event — •Yulia Kartavykh1,2, Wolfgang Dröge1, Linghua Wang3, and Roberto Bruno4 — 1Institute for Theoretical Physics and Astrophysics, University of Würzburg, D-97074, Würzburg, Germany — 2Ioffe Physical-Technical Institute, St. Petersburg 194021, Russia — 3School of Earth and Space Sciences, Peking University, 100871 Beijing, China — 4INAF-IAPS Istituto di Astrofisica e Planetologia Spaziali, I-00133 Roma, Italy
The modeling of solar particle propagation offers the possibility to derive transport coefficients and to test the validity of theories describing the interaction of energetic charged particles with magnetic field fluctuations. Here we analyze electrons in the energy range of 1 - 180 keV, observed by the Wind spacecraft following an impulsive solar flare on 20 October 2002. The event is characterized by weak, but measurable pitch angle scattering which allows a characterization of the pitch angle scattering coefficient Dµµ(µ), as well as by particle reflection at an outer boundary. Based on numerical solutions of the focused transport equation we present fits to the observed electron fluxes, with emphasis on a detailed modeling of the particles’ angular distributions. We compare the derived values of Dµµ(µ) for several energy ranges with the ones obtained from an analysis of the magnetic fluctuations observed during the event and current transport theories. Preliminary results indicate that the scattering of electrons at low energies is much weaker than predicted by the above models, and that at large wave numbers the slab component makes up only a few percent of the fluctuations.