Observations of the earth's continuum radiation in the distant magnetotail with ISEE 3

Details Observations of the earth's continuum radiation in the distant magnetotail with ISEE 3 Observations of the earth's continuum radiation in the distant magnetotail with ISEE 3

Dec 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990jgr....9520781s&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 95, Dec. 1, 1990, p. 20781-20791. Research supported by DOE.

Physics

3

Continuous Radiation, Earth Albedo, Geomagnetic Tail, Planetary Radiation, International Sun Earth Explorer 3, Magnetosheath, Plasma Density, Thermal Noise

Scientific paper

Observations of the earth's nonthermal continuum radiation made with the radio receiver on ISEE 3 are analyzed, emphasizing rapid crossings of the magnetopause in the distant magnetotail. The intensity and anisotropy of the radiation field are always found to be larger in the lobes than in the magnetosheath. The radiation is interpreted as arising from a source located at or near the plasmapause. It is suggested that the observed variations across the magnetopause of the intensity and anisotropy can be understood by taking into account the facts that the magnetotail is a plasma waveguide whose walls are sometimes rough and leaky and that there are density fluctuations in the magnetosheath. The efficiency with which the continuum power at 30 kHz is collected in the near-earth regions and ducted toward the distant tail is a strong, increasing function of the magnetosheath plasma frequency (MPF). The percentage of that power which travels in the magnetosheath decreases with increasing MPF.

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