Solar particle composition - Measurements in the March 1991 event at 2.5 AU

Details Solar particle composition - Measurements in the March 1991 event at 2.5 AU Solar particle composition - Measurements in the March 1991 event at 2.5 AU

Jun 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992georl..19.1251l&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 19, no. 12, June 19, 1992, p. 1251-1254. Research supported by NASA.

Physics

5

Chemical Composition, Energetic Particles, Interplanetary Medium, Solar Corpuscular Radiation, Ulysses Mission, Abundance, Heavy Ions, Iron, Oxygen

Scientific paper

The time evolution of the very large solar particle event occurring on days 82-90 (March 23-31), 1991, as measured at 2.5 AU by the instrumentation on the Ulysses spacecraft was quite complex. Measurements by the HI-SCALE instrument of the nuclear composition of the interplanetary particles at a time resolution of two hours provides information on the different interplanetary regions which swept over the spacecraft. The Fe/O abundance ratio is found to differ slightly in the regions before and after two tangential discontinuities. The Fe/O abundance ratio is also found to depend strongly on the energy/nucleon of the particle, with values of about 0.7 for energies of about 0.5-1.0 MeV/nucl. to values of about 0.2 for energies about 8-16 MeV/nucl.

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