Physics
Scientific paper
Jul 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975jgr....80.2751g&link_type=abstract
Journal of Geophysical Research, vol. 80, July 1, 1975, p. 2751-2763.
Physics
64
Atmospheric Radiation, Continuous Radiation, Earth Magnetosphere, Nonthermal Radiation, Outer Radiation Belt, Radio Emission, Satellite Observation, Terrestrial Radiation, Electric Field Strength, Explorer 43 Satellite, Plasma Frequencies, Plasma Waves, Radiation Spectra, Solar Wind
Scientific paper
It is shown that a weak nonthermal continuum is produced by the earth's magnetosphere extending over a very wide range of frequencies, from 500 Hz in the low-density regions of the magnetotail to above 100 kHz. The frequency spectrum of the continuum radiation consists of two components: a trapped component within the magnetosphere at frequencies below the solar wind plasma frequency and an escaping component propagating freely away from the earth at frequencies above the solar wind plasma frequency. It is also shown that the continuum radiation is generated in a broad region extending through the morning and early afternoon from about 4.0 to 14.0 hours local time immediately beyond the plasmapause boundary, at radial distances from 4.0 to 8.0 earth radii. Possible mechanisms underlying the generation of this radiation are discussed, including the gyrosynchrotron radiation from energetic electrons in the outer radiation zone.
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