Observations pertaining to the dynamics of the plasma sheet

Details Observations pertaining to the dynamics of the plasma sheet Observations pertaining to the dynamics of the plasma sheet

Oct 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977phdt........39d&link_type=abstract

Ph.D. Thesis Iowa Univ., Iowa City.

Physics

Geomagnetic Tail, Interplanetary Gas, Plasma Dynamics, Plasma Probes, Plasma Sheaths, Imp, Magnetic Fields, Plasma Layers, Plasma Temperature, Proton Flux Density, Velocity Distribution

Scientific paper

Plasmas on the surface of the plasma sheet at its interface with the high-latitude tail are studied at approximately 30 to 40 earth radii in the tail of the earth's magnetosphere with LEPEDEA plasma instrumentation on board the earth-orbiting IMP-7 and IMP-8 satellites. Protons at this interface are frequently found to be flowing towards earth with large velocities greater than 400 km(sec)-1. Velocities measured on the plasma sheet's surface average greater than those measurements at random locations within the plasma sheet. Ten of the twenty cases studied exhibit plasma sheet cooling subsequent to the encounter. Characteristic anisotropic proton velocity distributions are commonly measured for the earthward jetting plasma. A three-parameter model is presented that explains these observed distributions and that places a field aligned acceleration region well tailward of the spacecraft.

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