Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003apj...594..592s&link_type=abstract
The Astrophysical Journal, Volume 594, Issue 1, pp. 592-604.
Astronomy and Astrophysics
Astronomy
8
Sun: Flares, Sun: Particle Emission
Scientific paper
Using 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 Ultra-Low-Energy Isotope Spectrometer on ACE, we have classified the events according to their 0.5-2.0 MeV nucleon-1 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.
Christian Eric R.
Cohen Christina Mae S.
Cummings Alan C.
Desai Mihir I.
Dwyer Joesph R.
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