Singly charged energetic helium emitted in solar flares

Details Singly charged energetic helium emitted in solar flares Singly charged energetic helium emitted in solar flares

Jun 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...246l..81h&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 246, June 1, 1981, p. L81-L84. Bundesministerium für Forschung und T

Astronomy and Astrophysics

Astrophysics

23

Abundance, Energetic Particles, Helium Ions, Solar Corpuscular Radiation, Solar Cosmic Rays, Solar Flares, Chromosphere, Histograms, International Sun Earth Explorer 3, Interplanetary Space, Solar Activity Effects, Solar Corona

Scientific paper

First direct charge state measurements of 0.41-1.05 MeV per nucleon helium accelerated at the sun reveal surprisingly large abundances of singly ionized helium, with typical He(+)/He(++) ratios between 0.04 and 0.21. This unexpected overabundance of He(+) was observed in each of the three large solar-flare particle events which occurred between 1978 August and 1979 October. The data were obtained with the Max-Planck-Institut/University of Maryland Experiment on board the ISEE-3 spacecraft. The observations suggest either strong coronal temperature inhomogeneities including cool regions of approximately 100,000 K or injection of 'cold' chromospheric/photospheric material into the flare acceleration region.

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