Other
Scientific paper
Sep 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aipc..528..115b&link_type=abstract
ACCELERATION AND TRANSPORT OF ENERGETIC PARTICLES OBSERVED IN THE HELIOSPHERE: ACE 2000 Symposium. AIP Conference Proceedings, V
Other
1
Neutrino, Muon, Pion, And Other Elementary Particles, Cosmic Rays
Scientific paper
We have used ACE and Wind data to study C/O and Fe/O ratios at ~2.6-15 MeV/nuc in nine large solar energetic particle (SEP) events between November 1997 and November 1998. Six events have event-integrated Fe/O ratios that are larger than the nominal coronal value by a factor of two or more. However, the energetic storm particle event of 25 August 1998 single-handedly restores the fluence-weighted Fe/O average to nearly the coronal value. We suggest that this balancing indicates a common acceleration mechanism in all of these events. We also compare SEP results to a recent ~300-day survey of slow solar wind by Ulysses. The average solar-wind C/O ratio is significantly larger (by ~40%) than in SEPs and in the photosphere. The origin of this difference in C/O is not understood. Finally, we also use 1-hour and 2-hour averaged data to examine intra-event correlations of SEP Fe/O vs. C/O. .
Boberg Paul. R.
Tylka Allan J.
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