HR: 1340h
AN: SH33A-1190 INVITED [Abstracts]
TI: Energetic Particles Associated with the Interplanetary Shock of 25 September 2001
AU: * von Rosenvinge, T
EM: tycho@milkyway.gsfc.nasa.gov
AF: NASA/Goddard Space Flight Center, Code 661, Greenbelt, MD 20771
United States
AU: Cohen, C
EM: cohen@srl.caltech.edu
AF: California Institute of Technology, MS 220-47, Pasadena, CA 91125
United States
AU: Cummings, A
EM: ace@srl.caltech.edu
AF: California Institute of Technology, MS 220-47, Pasadena, CA 91125
United States
AU: Leske, R
EM: ral@srl.caltech.edu
AF: California Institute of Technology, MS 220-47, Pasadena, CA 91125
United States
AU: Mewaldt, R
EM: rmewaldt@srl.caltech.edu
AF: California Institute of Technology, MS 220-47, Pasadena, CA 91125
United States
AU: Stone, E
EM: ecs@srl.caltech.edu
AF: California Institute of Technology, MS 220-47, Pasadena, CA 91125
United States
AU: Wiedenbeck, M
EM: Mark.E.Wiedenbeck@jpl.nasa.gov
AF: Jet Propulsion Laboratory, Pasadena, CA 91109, MS 169-327, Pasadena, CA 91109
United States
AB:
We report on the elemental abundances of energetic particles associated with an interplanetary shock which passed the
Advanced Composition Explorer (ACE) spacecraft at $\sim$ 20:05 UT on 25 September 2001. The shock is associated with a solar
X-ray event (X2.6) at S16E23 on 24 September at $\sim$ 10:38 UT. This corresponds to an average speed of 1232 km/sec to
reach 1 AU. Heavy elements above 14 MeV/nucleon were observed from He to Fe. The time-intensity profile for He is that of a
classic Energetic Storm Particle event, i.e. there is a shock-associated increase riding on top of a solar particle event
profile. This increase is $\sim$ 12 hours wide and peaks $\sim$ 6 to 8 hours after the shock arrival. What is unusual
about this event is that the time-intensity profiles of O and Fe are considerably different from the He profile. This event
illustrates some of the difficulties in relating observations to current models of shock acceleration.
This research was supported by NASA at the Goddard Space Flight Center, the California Institute of Technology (under Grant
NAG5-12929), and the Jet Propulsion Laboratory.
DE: 2118 Energetic particles, solar
SC: SPA-Solar and Heliospheric Physics [SH]
MN: 2004 AGU Fall Meeting