Berlin 2014 – scientific programme
Parts | Days | Selection | Search | Updates | Downloads | Help
EP: Fachverband Extraterrestrische Physik
EP 8: Sonne und Heliosphäre (II)
EP 8.4: Talk
Friday, March 21, 2014, 11:30–11:45, DO24 1.103
Anisotropies of wide-spread solar energetic electron events observed with STEREO and ACE — •Nina Dresing1, Raúl Gómez-Herrero2, Andreas Klassen1, Olga Malandraki3, Wolfgang Dröge4, and Yulia Kartavykh4,5 — 1IEAP, University of Kiel, Germany — 2Space Research Group, University of Alcalá, Spain — 3National Observatory of Athens, Greece — 4Institut für Theoretische Physik und Astrophysik, University of Würzburg, Germany — 5Ioffe Physical-Technical Institute, St. Petersburg, Russian Federation
STEREO, in combination with near-Earth observatories as ACE or Wind provides three well separated viewpoints, which are perfectly suited to investigate SEP events and their longitudinal dependences. We collected a list of 21 near-relativistic wide-spread electron events in the period from 2009 to mid 2013, where we request a minimum longitudinal separation angle of 80 degrees between the source active region at the Sun and the magnetic footpoint of one spacecraft observing the event. Anisotropies are investigated to disentangle source and transport mechanisms leading to the wide particle spreads. One favorable mechanism is efficient perpendicular transport in the IP medium leading to vanishing anisotropies at well-separated positionis. Another scenario is a large particle spread close to the Sun either due to a coronal shock or due to coronal transport. Here, we expect significant anisotropy at 1 AU due to the wide injection range at the Sun and the afterwards focusing during the outwards propagation. For both of the above scenarios we find events in our sample, which suit the expected observations and even further events, which do not agree with these.