Implications of large flow velocity signatures in nearly isotropic ion distributions

Details Implications of large flow velocity signatures in nearly isotropic ion distributions Implications of large flow velocity signatures in nearly isotropic ion distributions

Apr 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988georl..15..303w&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 15, April 1988, p. 303-306. NASA-supported research.

Physics

32

Energetic Particles, Flow Velocity, International Sun Earth Explorers, Ion Distribution, Magnetospheric Ion Density, Plasma Layers, Helium Ions, Hydrogen Ions, Isotropic Media, Magnetic Dipoles, Satellite-Borne Instruments

Scientific paper

ISEE-1 energetic ion distributions are compared with previously published lower-energy ISEE-1 H(+) and He(2+) distributions in the quiet-time plasma sheet at about 15 earth radii and within about 1 earth radius of the expected neutral sheet position. Although moment calculations performed over the nearly isotropic H(+) and He(2+) plasma distributions yield low bulk velocities of less than 14 km/s, the spectral shapes of these signatures are indicative of high flow speeds. It is suggested that H(+) and H(2+) ions of solar wind origin were accelerated through an electrostatic potential of about 2.4 kV prior to the ISEE-1 observations in the plasma sheet on a closed magnetospheric field line, and that a second plasma sheet population existed at this ISEE-1 position in the geomagnetic field.

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