Relationship between energetic particles and plasmas in the distant plasma sheet

Details Relationship between energetic particles and plasmas in the distant plasma sheet Relationship between energetic particles and plasmas in the distant plasma sheet

Apr 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981georl...8..349s&link_type=abstract

Geophysical Research Letters, vol. 8, Apr. 1981, p. 349-352.

Physics

44

Earth Magnetosphere, Energetic Particles, Explorer 47 Satellite, Plasma Sheaths, Plasma-Particle Interactions, Space Plasmas, Cold Plasmas, High Temperature Plasmas, Plasma Diagnostics, Plasma Spectra, Satellite Observation, Spectral Energy Distribution

Scientific paper

Measurements of ions from three different instruments on the IMP-7 and 8 spacecraft are combined to yield the differential energy spectra of ions over the entire energy range of 100 eV to 4 MeV in the earth's distant (30 to 40 earth radii) plasma sheet. These spectra, obtained during times of relatively small bulk flow velocities, span the intensity range from 10 to the -5th to 10 to the 5th per sq cm-sec-sr-keV, varying smoothly over the entire energy range both when the plasma is cold (about 1 keV) and hot (about 9 keV). Overall, the shape of the spectrum resembles a Maxwellian but with a high energy (not less than 50 keV) tail described well by a power law. The high energy tail is displaced in a parallel fashion to higher or lower intensities when the plasma is hot or cold, respectively. It is found that the energetic particle populations in the plasma sheet appear to be directly related to the mean thermal energies of the corresponding plasmas.

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