Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999georl..26..141m&link_type=abstract
Geophysical Research Letters, Volume 26, Issue 2, p. 141-144
Astronomy and Astrophysics
Astrophysics
44
Solar Physics, Astrophysics, And Astronomy: Energetic Particles, And Astronomy: Flares, And Astronomy: Corona, And Astronomy: Coronal Mass Ejections
Scientific paper
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.
Cohen Christina Mae S.
Cummings Alan C.
Dwyer Joesph R.
Gold Robert E.
Krimigis Stamatios M.
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