Jena 2013 – wissenschaftliches Programm
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EP: Fachverband Extraterrestrische Physik
EP 11: Sonne und Heliosphäre III
EP 11.3: Vortrag
Freitag, 1. März 2013, 12:00–12:15, HS 9
Wide-spread SEP events observed with STEREO, SOHO and ACE — •Nina Dresing1, Raúl Gómez-Herrero2, Andreas Klassen1, Bernd Heber1, Wolfgang Dröge3, Yulia Kartavykh3,4, and Olga Malandraki5 — 1IEAP Universität Kiel, Kiel, Deutschland — 2Space Research Group, University of Alcalá, Alcalá, Spain — 3Institut für Theoretische Physik und Astrophysik, Universität Würzburg, Würzburg, Germany — 4Ioffe Physical-Technical Institute, St. Petersburg, Russian Federation — 5National Observatory of Athens, Athens, Greece
The two STEREO spacecraft, in combination with near-Earth observatories like SOHO and ACE, provide three well separated viewpoints, which are best suited to investigate SEP events and their longitudinal dependences.
Requesting a minimum longitudinal separation angle of 80 degrees between the source active region at the Sun an the magnetic footpoint of one spacecraft observing the event we find an ensemble of 21 wide-spread events which were observed at least by two spacecraft.
We investigate the events in a statistical manner in terms of maximum intensities, onset delays, rise times, anisotropies and correlation to other phenomena like CMEs or type II radio bursts to shed some light on the physical processes yielding such extremely large angular particle distributions. For events with sufficient anisotropies and pitch angle coverage we apply a 1D propagation model to determine the mean free path and injection function fitting these observations.