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dc.contributor.authorSlocum, Penny L.
dc.contributor.authorStone, Edward C.
dc.contributor.authorLeske, Richard A.
dc.contributor.authorChristian, Eric R.
dc.contributor.authorCohen, Christina M S
dc.contributor.authorCummings, Alan C.
dc.contributor.authorDesai, Mihir I.
dc.contributor.authorDwyer, Joseph R.
dc.contributor.authorMason, Glenn M.
dc.contributor.authorMazur, Joseph E.
dc.date.accessioned2017-02-17T18:03:49Z
dc.date.available2017-02-17T18:03:49Z
dc.date.issued2003-09-01
dc.identifier.citationSlocum, P. L., Stone, E. C., Leske, R. A., Christian, E. R., Cohen, C. M. S., Cummings, A. C., . . . Wiedenbeck, M. E. (2003). Elemental fractionation in small solar energetic particle events. Astrophysical Journal, 594(1 I), 592-604. doi:10.1086/376755en_US
dc.identifier.urihttp://hdl.handle.net/11141/1187
dc.description.abstractUsing the Solar Isotope Spectrometer on the Advanced Composition Explorer (ACE), we have measured the 11.0-21.8 MeV nucleon-1 heavy (Z ≥ 6) element abundances of 39 small solar energetic particle (SEP) events that occurred between 1998 April 3 and 2002 February 26. Using He isotope data from the UltraLow-Energy Isotope Spectrometer on ACE, we have classified the events according to their 0.5-2.0 MeV nucleonˉ¹ ³He/⁴He ratios. We find that their average heavy-element composition is similar to that of either large gradual events or ³He-rich events, depending on their ³He/⁴He ratio. As seen in recent studies of small SEP events, we find that the heavy-element intensities relative to C increase with the ³He/⁴He ratios. The dependence of the heavy-element abundances on first ionization potential (FIP) has been derived, using a model consisting of a power law in Q/M (and Z) times a step function in FIP. We report the magnitude of the FIP factor in each event and find that it varies from ∼2 to 7 with no clear dependence on the ³He/⁴He ratio.en_US
dc.language.isoen_USen_US
dc.rightsThis published article is made available in accordance with the publisher’s policy. It may be subject to U.S. copyright law.en_US
dc.rights.urihttps://aas.org/publications/aas-copyright-policyen_US
dc.titleElemental Fractionation in Small Solar Energetic Particle Eventsen_US
dc.typeArticleen_US
dc.identifier.doi10.1086/376755


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