Energy spectrum of ions accelerated through Fermi process at the terrestrial bow shock

Details Energy spectrum of ions accelerated through Fermi process at the terrestrial bow shock Energy spectrum of ions accelerated through Fermi process at the terrestrial bow shock

Sep 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981jgr....86.7595t&link_type=abstract

Journal of Geophysical Research, vol. 86, Sept. 1, 1981, p. 7595-7606.

Physics

53

Bow Waves, Energy Spectra, Interplanetary Magnetic Fields, Ion Motion, Particle Acceleration, Shock Waves, Abundance, Earth Environment, Time Lag, Upstream, Wave Scattering

Scientific paper

The observed energy spectra and abundance characteristics of the energetic ions observed upstream of the earth's bow shock are explained in terms of a first-order Fermi acceleration process. The process is described as a mechanism of multiple reflection between the bow shock and the upstream wave field. The efficiency of the scattering process in the upstream waves is estimated, and the energy spectra of accelerated particles are calculated and compared with observations. It is found that the observed time lag of the high-energy particle increase with respect to the lower-energy increase, the functional form of the energy spectrum and the invariance of ion abundance at the same energy per charge can all be accounted for features of the Fermi acceleration model. It is suggested that further studies be conducted of the energy spectra of ions of various mass/charge ratios to determine the extent of the energy/change invariance.

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