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Energetic particle composition at 1 au during periods of moderate interplanetary particle fluxes

Slocum, P. L. and Wiedenbeck, M. E. and Christian, E. R. and Cohen, C. M. S. and Cummings, A. C. and Leske, R. A. and Mewaldt, R. A. and Stone, E. C. and von Rosenvinge, T. T. (2002) Energetic particle composition at 1 au during periods of moderate interplanetary particle fluxes. Advances in Space Research, 30 (1). pp. 97-104. ISSN 0273-1177. doi:10.1016/S0273-1177(02)00264-8.

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It has recently been proposed that residual energetic ions from preceding impulsive solar energetic particle (SEP) events may contribute to the source population for the larger gradual events accelerated by CME-driven shocks (Mason et al., 1999). This suggests that there may be impulsive SEP material left in interplanetary space during periods relatively free of energetic particle activity. To test this idea we have studied the heavy ions and ^3He present at L1 during periods of low—to—moderate energetic particle fluxes between February 1998 and April 2000. Using the Solar Isotope Spectrometer on the Advanced Composition Explorer, we have measured the energy spectra of heavy elements (Z≥6) and ^3He over the ranges ∼8–20 MeV/nucleon and ∼4–15 MeV/nucleon, respectively. In these energy spectra, we have looked for spectral and compositional signatures typically characteristic of impulsive or gradual SEP events. We discuss the implications of these observations for the origin of particles accelerated in gradual SEP events.

Item Type:Article
Related URLs:
URLURL TypeDescription
Wiedenbeck, M. E.0000-0002-2825-3128
Christian, E. R.0000-0003-2134-3937
Cohen, C. M. S.0000-0002-0978-8127
Cummings, A. C.0000-0002-3840-7696
Leske, R. A.0000-0002-0156-2414
Mewaldt, R. A.0000-0003-2178-9111
Stone, E. C.0000-0002-2010-5462
Additional Information:© 2002 COSPAR. Published by Elsevier Science Ltd. Available online 21 August 2002. This research was supported by NASA at Caltech (under grant NAG5-6912), JPL, and GSFC. We thank the ULEIS and EPAM science teams for providing the He and proton fluxes used in this paper.
Group:Space Radiation Laboratory
Funding AgencyGrant Number
Goddard Space Flight CenterUNSPECIFIED
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Other Numbering System NameOther Numbering System ID
Space Radiation Laboratory2002-04
Issue or Number:1
Record Number:CaltechAUTHORS:20140826-134134744
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Official Citation:P.L. Slocum, M.E. Wiedenbeck, E.R. Christian, C.M.S. Cohen, A.C. Cummings, R.A. Leske, R.A. Mewaldt, E.C. Stone, T.T. von Rosenvinge, Energetic particle composition at 1 au during periods of moderate interplanetary particle fluxes, Advances in Space Research, Volume 30, Issue 1, 2002, Pages 97-104, ISSN 0273-1177, (
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:48929
Deposited By: Ruth Sustaita
Deposited On:26 Aug 2014 20:52
Last Modified:10 Nov 2021 18:37

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