D. Maia, M. Pick Observatoire Paris, Meudon, FRANCE S.E. Hawkins, E.C. Roelof Johns Hopkins University/APL, Laurel, MD, USA
We investigate the solar origin and propagation of well collimated
energetic electron events measured in situ by the EPAM experiment on
the ACE spacecraft.
EPAM measures electrons in the energy of range of from 40 to 300 keV over a wide range look directions and with better than 1 minute time resolution. During the events in our study, these particles are strongly collimated along the magnetic field. As such, these near-relativistic (beta=0.4-0.7) particles tend to be scatter free and their observed arrival at ACE provides a good estimate of the release time back to the Sun. We combine these observations with fast imaging of the solar corona in the meter wave domain provided by the Nancay radioheliograph and dynamic spectral information from the WAVES experiment on the WIND spacecraft. Together, this complement of observations of solar energetic particles events provides insight into the onset times and sites of particle acceleration in the low corona. Using coronagraphic observations from the LASCO experiment on SOHO we are able to follow the dynamical behavior of the low corona during the events.