Stuttgart 2012 – wissenschaftliches Programm

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EP: Fachverband Extraterrestrische Physik

EP 6: Sonne und Heliosphäre I

EP 6.8: Vortrag

Mittwoch, 14. März 2012, 15:45–16:00, V55.21

Modeling of one-directional spike events — •Yulia Kartavykh¹, Andreas Klassen², Wolfgang Dröge¹, Raul Gómez-Herrero², Bernd Heber², and Karl-Ludwig Klein³ — ¹Institut für Theoretische Physik und Astrophysik, Universität Würzburg, D-97074 Würzburg, Germany — ²Institut für Experimentelle und Angewandte Physik, Universität Kiel, D-24118 Kiel, Germany — ³LESIA-CNRS UMR 8109, Observatoire de Paris, F-92195 Meudon, France

Since the 1970s there were observations of solar electron events having some unusual temporal and directional characteristics. These so-called spike events exhibit very short and almost symmetric time profiles, no longer than 10-20 minutes, and one-directional pitch-angle distributions. In this work we present a model that takes into account the effects of focusing, streaming along the magnetic field lines and scattering off magnetic irregularities on the transport of solar electrons and apply it to the spike event observed on 26 February 2011. We find that our model can reproduce the observed characteristics of spike events well if the assumption is made that, compared to usual solar electron events, the scattering at pitch angles around 90 degrees is strongly suppressed.