Measurement of He-3-rich flares onboard HELIOS 1 and 2

Details Measurement of He-3-rich flares onboard HELIOS 1 and 2 Measurement of He-3-rich flares onboard HELIOS 1 and 2

Oct 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980icrc....5...95h&link_type=abstract

In: International Cosmic Ray Conference, 16th, Kyoto, Japan, August 6-18, 1979, Conference Papers. Volume 5. (A81-12386 02-93) T

Computer Science

Abundance, Helios Satellites, Helium Isotopes, Isotopic Enrichment, Particle Acceleration, Solar Cosmic Rays, Solar Flares, High Energy Electrons, High Energy Interactions, Solar Electrons, Solar Flux Density, Solar Protons

Scientific paper

During the time period from December 1974 to December 1977 nine solar events with He-3/He-4 ratios exceeding 0.2 were observed on Helios 1 and 2. The results of earlier studies, namely the association of He-3-enrichments with small events and with enhanced ratios of He-4/H-1, and no observed increases in H-2 and H-3 are confirmed. It is found that He-3-rich events are accompanied by relativistic electrons with an electron/proton ratio similar to that of normal events. The time structure of electron/proton rich events resembles that of prompt events with no obvious difference in intensity profiles between different nuclei. One unusual feature is the occurrence of He-3-rich events during quiet solar wind conditions.

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