Energetic protons and magnetic field fluctuations upstream of the earth's bow shock

Details Energetic protons and magnetic field fluctuations upstream of the earth's bow shock Energetic protons and magnetic field fluctuations upstream of the earth's bow shock

Jul 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990baicz..41..221k&link_type=abstract

Astronomical Institutes of Czechoslovakia, Bulletin (ISSN 0004-6248), vol. 41, no. 4, July 1990, p. 221-230.

Astronomy and Astrophysics

Astronomy

Bow Waves, Geomagnetism, Magnetic Fields, Proton Flux Density, Shock Waves, Anisotropy, Energy Spectra, Ion Distribution

Scientific paper

The variety of temporal profiles, energy spectra and anisotropy of ions (assuming all being protons) with energies above 10 keV, as measured in the dusk-afternoon sector upstream of the earth's bow shock, allows inferrence of the nature of the flux formation. Several typical events are discussed. The coupled behavior of waves and particles mutually interacting is stressed, and the rough estimation of energy density of the two constituents is found to agree with the scenario of formation of upstream proton fluxes due to these interactions. The long-duration events exhibit a prolonged inverse velocity dispersion, a sign of regular (or first-order Fermi) acceleration. The rate of energy increase in the course of such a process is satisfactorily explained by the nonstationary regular acceleration at the shock. There is some evidence that particle leakage from the magnetosphere contributed substantially to the observed population in one particular case, on May 2, 1985.

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