Physics
Scientific paper
Sep 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003aipc..679..660d&link_type=abstract
SOLAR WIND TEN: Proceedings of the Tenth International Solar Wind Conference. AIP Conference Proceedings, Volume 679, pp. 660-6
Physics
3
Particle Emission, Solar Wind, Solar Wind Plasma, Sources Of Solar Wind
Scientific paper
A multi-spacecraft analysis of the decay phase of 26 SEP events is presented, based upon Helios 1 and 2 and IMP8 data. The Helios spacecraft were magnetically connected to the far side of the Sun for part of their lifetime, and detected SEP events at large longitudinal separation from the location of the associated flares. In this study, 26 SEP events are considered, 19 of which observed by three spacecraft and 7 by two. For each event, the total event duration at 1 electron and 2 proton energies is measured. A plot of event duration versus the longitudinal distance Δφ between the associated flare location and the footpoint of the magnetic field line through the spacecraft reveals asymmetries in the detection and duration of SEP events. First, SEP events associated with flares far to the east of the spacecraft footpoint are 5 times more likely than events associated with flares far to the west. Second, the event duration shows a tendency to decrease as the location of the associated flare changes from east to west. We show that the first asymmetry is not a result of the trajectory of the spacecraft.
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