Composition and Spectra of Solar Energetic Particles from ~0.1 to >100 MeV/nucleon during the April, 2002 Storms Period

Details Composition and Spectra of Solar Energetic Particles from ~0.1 to >100 MeV/nucleon during the April, 2002 Storms Period Composition and Spectra of Solar Energetic Particles from ~0.1 to >100 MeV/nucleon during the April, 2002 Storms Period

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsa12a..03c&link_type=abstract

American Geophysical Union, Fall Meeting 2002, abstract #SA12A-03

Physics

2118 Energetic Particles, Solar

Scientific paper

We report measurements of the composition, energy spectra, and time variations of solar energetic particles (SEPs) during the April 14-24, 2002 Storms period. This period included three fast coronal mass ejections (CMEs) and several interplanetary shocks that affected the low-energy particle intensity at 1 AU, including the 4/21/02 SEP event that was among the largest of solar cycle 23. We use data from ACE and SAMPEX to measure the energy spectra of accelerated ions from H to Fe (1 <= Z <= 26) over the energy range from ~0.1 to >100 MeV/nucleon during the course of this event. By comparing the onset time of >30 MeV protons with CME images from SOHO we determine that the highest energy particles were first accelerated within 3 solar radii of the Sun. The high-energy (>5 MeV/nucleon) spectra of all species have a 'knee' at 10-20 MeV/nucleon - at lower energies (<1 MeV/nucleon) there is a separate spectral component that most likely reflects the contributions of particles accelerated by interplanetary shocks as they approach 1 AU. By combining data from several instruments over a wide energy range it is possible to characterize the separate acceleration processes at work during this time period and to provide a comprehensive measure of solar and interplanetary particle input to the Earth's upper atmosphere.

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