ISEE-3 observations of the earth's radio continuum through the bow shock and magnetosheath and in the magnetosphere

Details ISEE-3 observations of the earth's radio continuum through the bow shock and magnetosheath and in the magnetosphere ISEE-3 observations of the earth's radio continuum through the bow shock and magnetosheath and in the magnetosphere

Jun 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988angeo...6..309s&link_type=abstract

Annales Geophysicae (ISSN 0980-8752), vol. 6, June 1988, p. 309-318. CNES-DOE-NASA-supported research.

Physics

4

Bow Waves, Earth Magnetosphere, International Sun Earth Explorer 3, Magnetosheath, Shock Waves, Terrestrial Radiation, Magnetopause, Plasma Density, Radio Emission, Solar Wind

Scientific paper

On October 1 1983, ISEE-3 crossed the earth's bow shock several times and entered the magnetosphere while continuously recording the nonthermal continuum (NTC) radio emission which is generated inside the magnetosphere. The effects of the solar wind, the bow shock, the magnetosheath, and the magnetopause on the propagation of the NTC are studied. On that day it is found that: (1) the relative values of the NTC low frequency cut-off in the solar wind and in the magnetosheath is due to an unusually high density overshoot in the bow shock, 7 to 11 times the solar wind density; (2) refraction at the interface between the magnetosheath and the solar wind can explain most of the decrease in the source angular size when the observer travels away from the earth; (3) plasma density irregularities in the magnetosheath cause considerable scattering of the NTC, and this effect gives a large apparent size to the NTC source when observed from inside the magnetosheath; and (4) the apparent source is also relatively large inside the magnetosphere, probably due to an approach to ray isotropy caused by oblique reflections from the magnetopause.

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