Energetic ion beam in the earth's magnetotail lobe

Details Energetic ion beam in the earth's magnetotail lobe Energetic ion beam in the earth's magnetotail lobe

Jan 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983georl..10...13l&link_type=abstract

Geophysical Research Letters, vol. 10, Jan. 1983, p. 13-16.

Physics

31

Energetic Particles, Geomagnetic Tail, Ion Beams, Space Plasmas, Angular Distribution, Energy Spectra, Explorer 50 Satellite, Magnetic Measurement, Proton Beams

Scientific paper

IMP-8 high time resolution measurement of energetic particles in the earth magnetotail indicated prominent peaks in the proton energy at 0.1-0.7 MeV. A drifting Kappa distribution was fitted to the spectra and a 15-45 keV, proton beam, with densities of 4/10 million to 5/10,000 cu cm jetting tailward at 3500-7000 km/sec, was modelled. It is noted that extension of the beam from 1-5 earth radii would require an energy flux of 1.7 x 10 to the 17th ergs/sec, close to observed values of magnetospheric substorms. However, acceleration of the plasma sheet population, which has a density of 0.1/cu cm, would result in only a small fraction of the protons being accelerated to the higher energies. Candidates for the acceleration mechanisms are discussed

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