Coronal origin of particle events detected by EPAM:
multi-intruments observations
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.