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Mason et al. 1999

Mason, G.M., Cohen, C.M.S., Cummings, A.C., Dwyer, J.R., Gold, R.E., Krimigis, S.M., Leske, R.A., Mazur, J.E., Mewaldt, R.A., Möbius, E., Popecki, M., Stone, E.C., von Rosenvinge, T.T. and Wiedenbeck, M.E. (1999). Particle acceleration and sources in the November 1997 solar energetic particle events. Geophysical Research Letters 26: doi: 10.1029/1998GL900235. issn: 0094-8276.

We report studies of two large solar energetic particle (SEP) events on Nov. 4 and 6, 1997 that were observed using advanced energetic particle detectors on the ACE and the Wind spacecraft. Both events showed enriched Fe/O, and had a ~1 MeV/n 3He/4He ratio=2.1¿10-3, 4 times the coronal value. The Nov. 6 event had exceptionally hard spectra, with much higher intensities of high energy (10s of MeV) particles than the Nov. 4 event, yet below 1 MeV/n the intensities in the Nov. 6 event were lower than for Nov. 4. Strong, complex temporal variations observed for ~120 keV Fe/O contrasted with only gradual changes of this ratio at ~25 MeV/n. A spectral break was observed in the Nov. 6 event, wherein below a few MeV/n the spectra became harder. Taken together, these observations point to different seed and acceleration mechanisms dominating at low and high energies in these events. ¿ 1999 American Geophysical Union

BACKGROUND DATA FILES

	Abstract

Keywords
Solar Physics, Astrophysics, and Astronomy, Energetic particles, Solar Physics, Astrophysics, and Astronomy, Flares, Solar Physics, Astrophysics, and Astronomy, Corona, Solar Physics, Astrophysics, and Astronomy, Coronal mass ejections

Journal
Geophysical Research Letters
http://www.agu.org/journals/gl/

Publisher
American Geophysical Union
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