Survey of He(+)/He(2+) abundance ratios in energetic particle events

Details Survey of He(+)/He(2+) abundance ratios in energetic particle events Survey of He(+)/He(2+) abundance ratios in energetic particle events

Jul 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...282l..39h&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 282, July 1, 1984, p. L39-L42.

Astronomy and Astrophysics

Astrophysics

14

Abundance, Energetic Particles, Helium Ions, Interplanetary Medium, Solar Flares, Data Correlation, Energy Spectra

Scientific paper

First results of a systematic study of the helium ionic charge distribution in the energy range 0.4-0.62 MeV per nucleon in energetic particle events are reported. Large fluctuations of the He(+)/He(2+) ratios are found, especially at low interplanetary particle fluxes. The ratios exceeded a value of 0.3 for 41 days and a value of 1.0 for 11 days out of the 216 days analyzed. The median of the distribution is He(+)/He(2+) = 0.11. No obvious association with optical flare events could be observed for the events richest in He(+). No significant differences were found between the proton energy spectra and the elemental abundances of helium relative to hydrogen and heavy ions for He(+)-rich events versus events low in He(+). However, it has been found that generally He(+)-rich events are predominantly low in energetic particle intensity.

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