Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991p%26ss...39...57m&link_type=abstract
(Colloquium on Phobos-Mars Mission, Paris, France, Oct. 23-27, 1989, Proceedings. A91-29558 11-91) Planetary and Space Science (
Astronomy and Astrophysics
Astronomy
8
Energetic Particles, Particle Telescopes, Solar Flares, Spaceborne Astronomy, Helium, Iron, Mars Probes, Oxygen, Solar Activity, Solar Corona
Scientific paper
The composition of energetic particles accelerated in solar flares has been studied using data from the Low Energy Telescope (LET) experiment aboard the Phobos spacecraft. The abundances relative to oxygen measured in six large solar flare events occurring in the period July 1988 to March 1989 exhibit a number of features. These include a large variability from event to event for Z not less than 10 ions, and an apparent inverse correlation between the event-averaged spectral index and the Fe/O ratio. These results are consistent with a model in which Fe-rich material is accelerated impulsively at the flare, whereas events with lower Fe/O ratios result from large-scale coronal shock acceleration. Composition measurements for the two shock events indicate that the ambient flare particles are the seed population in the energy range of LET.
Afonin Valeri
Gringauz K.
Marsden Richard G.
Wenzel Klaus-Peter
Witte Malte
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