Behavior of low-energy protons and alpha particles during a disturbed time period

Details Behavior of low-energy protons and alpha particles during a disturbed time period Behavior of low-energy protons and alpha particles during a disturbed time period

Apr 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976jgr....81.1794i&link_type=abstract

Journal of Geophysical Research, vol. 81, Apr. 1, 1976, p. 1794-1798.

Physics

2

Alpha Particles, Magnetic Disturbances, Solar Activity Effects, Solar Protons, Magnetospheric Instability, Particle Acceleration, Proton Energy, Satellite Observation, Solar Flares, Time Dependence

Scientific paper

The paper presents observations of 130- to 1200-keV protons and 40- to 420-keV/nucleon alpha particles made on the earth-orbiting spacecraft Imp 8 and Imp 7 during an active solar period in September 1974, concentrating, in particular, on an energetic storm particle (ESP) event observed in association with an interplanetary shock wave on September 21. It is found that the observed variations in the proton-to-alpha particle ratios and spectral indices can be explained either by 'pileup' or by acceleration models of ESP events. Several instances of local acceleration of particles in the near-earth environment are also discussed.

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