Composition and energy spectra of low energy ions observed upstream of the earth's bow shock on ISEE-1

Details Composition and energy spectra of low energy ions observed upstream of the earth's bow shock on ISEE-1 Composition and energy spectra of low energy ions observed upstream of the earth's bow shock on ISEE-1

Oct 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980icrc....3..140i&link_type=abstract

In: International Cosmic Ray Conference, 16th, Kyoto, Japan, August 6-18, 1979, Conference Papers. Volume 3. (A81-12386 02-93) T

Computer Science

Bow Waves, Energy Spectra, Ion Temperature, Satellite Observation, Shock Waves, Upstream, Composition (Property), Cosmic Rays, Ion Concentration, Particle Acceleration, Plasma Composition, Solar Wind

Scientific paper

The characteristics of eleven locally accelerated particle events in the energy range from 30 to 125 keV/Q observed upstream of the earth's bow shock have been determined, including composition, energy spectra, and intensity versus time profiles. The measurements were made with the Ultra Low Energy Charge Analyzer sensor on ISEE-1. The composition in these events is similar to that of the solar wind, with a He to proton ratio of 8% and a CNO to He ratio of 6%. The composition is reasonably constant only when evaluated at equal energy per charge. The energy spectra cannot be adequately fit by a single power law in energy; an exponential or Maxwellian in energy per charge gives a satisfactory representation of the spectra. The time-intensity profiles of these upstream events show an inverse velocity dispersion, which may provide clues to the responsible acceleration mechanism.

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