Solar Energetic Particle Observations From the STEREO Low Energy Telescope (LET)

Details Solar Energetic Particle Observations From the STEREO Low Energy Telescope (LET) Solar Energetic Particle Observations From the STEREO Low Energy Telescope (LET)

May 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agusmsh34a..06m&link_type=abstract

American Geophysical Union, Spring Meeting 2007, abstract #SH34A-06

Physics

2139 Interplanetary Shocks, 2451 Particle Acceleration, 7514 Energetic Particles (2114), 7984 Space Radiation Environment

Scientific paper

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.

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