Particle acceleration and sources in the November 1997 solar energetic particle events
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. Th...
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| Veröffentlicht in: | Geophysical research letters 1999-01, Vol.26 (2), p.141-144 |
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| creator | 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. Wiedenbeck, M. E. |
| description | 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. |
| doi_str_mv | 10.1029/1998GL900235 |
| format | Article |
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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. ; Wiedenbeck, M. E.</creator><creatorcontrib>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. ; Wiedenbeck, M. E.</creatorcontrib><description>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. 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| title | Particle acceleration and sources in the November 1997 solar energetic particle events |
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