Physics
Scientific paper
Aug 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976jgr....81.3966y&link_type=abstract
Journal of Geophysical Research, vol. 81, Aug. 1, 1976, p. 3966-3976.
Physics
12
Earth Magnetosphere, Electron Energy, Geomagnetism, Polar Caps, Rarefied Plasmas, Energy Spectra, Geomagnetic Tail, Interplanetary Magnetic Fields, Lines Of Force, Plasma Density, Plasma Layers
Scientific paper
The eccentric-orbiting satellite Imp 5 penetrated the distant polar magnetosphere at positions corresponding to those for magnetic field lines which intersect the earth's northern polar cap. Measurements of electron intensities with E not less than 250 eV in these regions of extremely low plasma densities were gained with an electrostatic analyzer. The observational period was January-October 1970. Electron intensities within the energy range 250 eV-50 keV were less by orders of magnitude than those typically encountered within the plasma sheet and over the auroral oval. However, dramatic temporal variations of average electron intensities in the polar cap region were found for orbit-to-orbit comparisons. The observed intensity variations showed a remarkable correlation with the polarity of the magnetic sector structure in the interplanetary medium: high intensities for 'away from the sun' sectors and low intensities for 'toward' sectors.
Frank Louis A.
Yeager D. Y.
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