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Published 2003 | Published
Book Section - Chapter Open

The Unusual Solar Particle Events of August 2002


Several highly unusual solar particle events occurred in August 2002, with high ^3^He/^4He ratios and enormous enhancements of heavy isotopes [5]. By examining proton, electron, and heavy ion intensities, Hα, X-ray, and radio flares and particle arrival times relative to them and to coronal mass ejections, we find that the 20 August 2002 event was the largest impulsive event yet seen in this solar cycle at energies >10 MeV/nucleon.

Additional Information

Copyright Universal Academy Press Inc. This work was funded by NASA at Caltech (under grants NAG5-6912 and NAG5-12929), JPL, and the Goddard Space Flight Center. Details on solar activity and GOES data were obtained from NOAA through the Space Environment Center web site. We thank the ACE/EPAM, Wind/WAVES, and SOHO/LASCO teams for making their data public.

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August 19, 2023
October 23, 2023