Physics
Scientific paper
Jun 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978jgr....83.2533k&link_type=abstract
Journal of Geophysical Research, vol. 83, June 1, 1978, p. 2533-2542.
Physics
1
Auroral Ionization, Plasma Density, Satellite-Borne Instruments, Thermal Plasmas, Annual Variations, Electron Density (Concentration), Electron Plasma, Electrostatic Probes, Energy Transfer, Interplanetary Magnetic Fields, Ion Density (Concentration), Light Emission
Scientific paper
The quiet north polar cleft at 1400 km was studied by Isis-2 instruments, and data from the retarding potential analyzer and the cylindrical electrostatic probe show that thermal plasma density fluctuations are distributed in a region between 75 deg and 82 deg invariant latitude and approximately dawn to dusk. Cleft shape and shape variations are described. Thermal ions and thermal electrons usually fluctuated together, but suprathermal electrons fluctuated independently. Data on thermal plasma patterns correlates fairly well with observations of soft particles and auroral optical emissions and not as well with measurements of high-energy particles. The data suggest that the energy source for the thermal irregularities is associated with soft particles and that precipitating high-energy particles do not drive the thermal plasma at these altitudes.
Brace Larry H.
Kayser Susan E.
Maier E. J.
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