Solar Energetic Particle Composition, Energy Spectra and Timing in the January 20, 2005 Event

Details Solar Energetic Particle Composition, Energy Spectra and Timing in the January 20, 2005 Event Solar Energetic Particle Composition, Energy Spectra and Timing in the January 20, 2005 Event

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agufmsh23a0320m&link_type=abstract

American Geophysical Union, Fall Meeting 2005, abstract #SH23A-0320

Other

2114 Energetic Particles (7514), 7513 Coronal Mass Ejections (2101), 7519 Flares, 7924 Forecasting (2722), 7984 Space Radiation Environment

Scientific paper

The solar energetic particle event of January 20, 2005 was, by some measures, the most intense in 30 years. The >100 MeV proton intensity exceeded that of the October 1989 event and also broke the so-called "streaming limit" by a factor of ~4. In addition it was the largest ground-level neutron monitor event in 49 years. Another surprising aspect of this event was the speed of its onset, the first particles arrived within 13 minutes of the flare onset and the intensity-maximum for >100 MeV protons was much faster than any other large SEP event that we have been able to identify. Using data from five instruments on the ACE, GOES, and SAMPEX spacecraft, we have measured the energy spectra of H, He, and heavier nuclei over the energy range from ~0.1 to several hundred MeV/nuc, and electrons from 0.03 to 8 MeV. All species can be characterized by power laws, with spectral indices of -2.2 to -2.5 extending from ~1 MeV/nucleon to at least 400 MeV/nucleon in the case of protons. We report on the time evolution of the composition and energy spectra in an effort to identify whether there are separate flare-accelerated and shock-accelerated components contributing to this event. We will also report on a comparison of the ion and electron arrival times at 1 AU with the timing of the CME, flare, and other electromagnetic signatures. This event poses a challenge to shock-acceleration theory - apparently particles with energies >1 GeV were accelerated within ~5 to10 minutes, while the CME was still very low in the corona.

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