HR: 17:35h
AN: SH34A-06    [Abstracts]
TI: Solar Energetic Particle Observations From the STEREO Low Energy Telescope (LET)
AU: * Mewaldt, R A
EM: RMewaldt@SRL.caltech.edu
AF: Caltech, 220-47 Downs Lab, Pasadena, CA 91125, United States
AU: Cohen, C S
EM: Cohen@SRL.caltech.edu
AF: Caltech, 220-47 Downs Lab, Pasadena, CA 91125, United States
AU: Mason, G M
EM: Glenn.Mason@jhuapl.edu
AF: Applied Physics Laboratory, Johns Hopkins University, Laurel, MD 20723, United States
AU: Cummings, A C
EM: ace@srl.caltech.edu
AF: Caltech, 220-47 Downs Lab, Pasadena, CA 91125, United States
AU: Davis, A J
EM: ad@srl.caltech.edu
AF: Caltech, 220-47 Downs Lab, Pasadena, CA 91125, United States
AU: Labrador, A W
EM: Labrador@srl.caltech.edu
AF: Caltech, 220-47 Downs Lab, Pasadena, CA 91125, United States
AU: Leske, R A
EM: ral@srl.caltech.edu
AF: Caltech, 220-47 Downs Lab, Pasadena, CA 91125, United States
AU: Miyasaka, H
EM: Miyasaka@srl.caltech.edu
AF: Caltech, 220-47 Downs Lab, Pasadena, CA 91125, United States
AU: Stone, E C
EM: ECS@srl.caltech.edu
AF: Caltech, 220-47 Downs Lab, Pasadena, CA 91125, United States
AU: von Rosenvinge, T T
EM: tycho@milkyway.gsfc.nasa.gov
AF: NASA/Goddard Space Flight Center, Code 661, Greenbelt, MD 20771, United States
AU: Wiedenbeck, M E
EM: mark.e.wiedenbeck@jpl.nasa.gov
AF: Jet Propulsion Laboratory, 4800 Oak Grove Drive, Pasadena, CA 91109, United States
AB: Each STEREO spacecraft includes a suite of four solar energetic particle (SEP) sensors (part of the IMPACT investigation) that measure the composition and energy spectra of SEP ions from H to Fe with energies from ~0.05 to ~100 MeV/nucleon, as well as electrons. The STEREO SEP sensors were first powered up in space in mid-November and were still being commissioned in early December when an X9 solar flare from active region 930 erupted at longitude E71. Several hours later real time data from STEREO and ACE signaled the start of a large SEP event. A subsequent X6.5 flare (at E57) apparently added to the SEP population, which peaked in intensity on December 7th. On December 13th and 14th this same active region released two more X-class flares and fast coronal mass ejections from W23 and W44, resulting in two additional large SEP events. We present observations of the December 2006 events from the Low Energy Telescope (LET) on STEREO, which measures SEP composition from ~3 to ~30 MeV/nucleon. Observations from the SIS and ULEIS instruments on ACE are used to extend the energy coverage. In addition, we present observations of impulsive SEP events observed by LET and by the Suprathermal Ion Telescope (SIT), which measures ion composition from ~0.05 to ~5 MeV/nuc. These new observations from STEREO are discussed in the context of SEP events observed earlier in solar cycle 23. This work was supported by NASA under NAG5-03131 and NAG5-12929.
DE: 2139 Interplanetary shocks
DE: 2451 Particle acceleration
DE: 7514 Energetic particles (2114)
DE: 7984 Space radiation environment
SC: SPA-Solar and Heliospheric Physics [SH]
MN: 2007 Joint Assembly