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Particle acceleration and sources in the November 1997 solar energetic particle events

Mason, G. M. and Cohen, C. M. S. and Cummings, A. C. and Dwyer, J. R. and Gold, R. E. and Krimigis, S. M. and Leske, R. A. and Mazur, J. E. and Mewaldt, R. A. and Möbius, E. and Popecki, M. and Stone, E. C. and 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 (2). pp. 141-144. ISSN 0094-8276. doi:10.1029/1998GL900235.

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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.

Item Type:Article
Related URLs:
URLURL TypeDescription
Mason, G. M.0000-0003-2169-9618
Cohen, C. M. S.0000-0002-0978-8127
Cummings, A. C.0000-0002-3840-7696
Krimigis, S. M.0000-0003-2781-2386
Leske, R. A.0000-0002-0156-2414
Mewaldt, R. A.0000-0003-2178-9111
Stone, E. C.0000-0002-2010-5462
Wiedenbeck, M. E.0000-0002-2825-3128
Additional Information:© 1999 by the American Geophysical Union. Received September 4, 1998; revised November 2, 1998; accepted November 11, 1998. Paper number 1998GL900235. We thank the many individuals at the University of Maryland, Caltech, Jet Propulsion Laboratory, NASA Goddard Space Flight Center, Johns Hopkins Univ. APL, and University of New Hampshire for the construction of the instruments. We thank C. Smith and D. McComas and the ACE MAG and SWEPAM teams for the shock identifications used here; R. Lepping and the Wind MFI team for the magnetic cloud identification; K. Ogilvie and the Wind SWE team for the solar wind speeds. This work was supported in part by NASA grants NAG 5-7228, NAG5-6912 and PC 251428.
Group:Space Radiation Laboratory
Funding AgencyGrant Number
NASANAG 5-7228
NASAPC 251428
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Other Numbering System NameOther Numbering System ID
Space Radiation Laboratory1999-66
Issue or Number:2
Record Number:CaltechAUTHORS:20140827-130259341
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Official Citation:Particle acceleration and sources in the November 1997 solar energetic particle events (pages 141–144) G. M. Mason, C. M. S. Cohen, A. C. Cummings, J. R. Dwyer, R. E. Gold, S. M. Krimigis, R. A. Leske, J. E. Mazur, R. A. Mewaldt, E. Möbius, M. Popecki, E. C. Stone, T. T. von Rosenvinge and M. E. Wiedenbeck DOI: 10.1029/1998GL900235
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:48993
Deposited By: Ruth Sustaita
Deposited On:27 Aug 2014 20:45
Last Modified:10 Nov 2021 18:38

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