Ionic charge state distribution of helium, carbon, oxygen, and iron in an energetic storm particle enhancement

Details Ionic charge state distribution of helium, carbon, oxygen, and iron in an energetic storm particle enhancement Ionic charge state distribution of helium, carbon, oxygen, and iron in an energetic storm particle enhancement

Jul 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...258l..57h&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 258, July 1, 1982, p. L57-L62. Bundesministerium für Forschung und T

Astronomy and Astrophysics

Astrophysics

18

Energetic Particles, Interplanetary Medium, Ion Charge, Positive Ions, Satellite Observation, Solar Flares, Carbon, Cosmic Rays, Helium Ions, Iron, Oxygen Ions, Temporal Distribution

Scientific paper

An analysis is presented of the ionic charge state distribution of He, C, O and Fe in the energetic storm particle event of September 28-29, 1978. Data were obtained with the ULEZEQ electrostatic analyzer-proportional counter on board the ISEE 3 spacecraft. The He(+)/He(++) ratio between 0.4 and 1 MeV/n is shown to be significantly lower during the energetic storm particle event than during the preceding period of solar flare particle enhancement, with a temporal evolution similar to that of the Fe/He ratio as reported by Klecker et al. (1981). Increases in the mean charge state for oxygen by about 3% and for iron by about 16% are also noted. The temporal variations in charge states are accounted for in terms of first-order Fermi acceleration of the pre-existing solar flare particles by a propagating interplanetary shock wave.

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