Joe Mazur
The Aerospace Corporation, 2350 E. El Segundo Blvd.,El Segundo CA 90245
Interplanetary particle events from impulsive solar
flares are enriched in Ne-Fe and in the 3He isotope compared
to the solar wind; they also show little scattering in the interplanetary
medium. The number of impulsive flare particle events observed at 1 AU
has significantly increased during the current rise to solar maximum and
we have observed their properties with unprecedented detail using instrumentation
on board the Advanced Composition Explorer (ACE) spacecraft. Launched into
an orbit about L1 in late 1997, ACE has measured the ionic compositions,
ionization states, and temporal profiles of dozens of impulsive flares.
We will summarize these observations, pointing out the variabilities in
the charge states, event profiles, and energy spectra as clues to the acceleration
and transport processes.