Terrestrial kilometric radiation. I - Spatial structure studies

Details Terrestrial kilometric radiation. I - Spatial structure studies Terrestrial kilometric radiation. I - Spatial structure studies

Dec 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976jgr....81.5948a&link_type=abstract

Journal of Geophysical Research, vol. 81, Dec. 1, 1976, p. 5948-5956.

Astronomy and Astrophysics

Astronomy

14

Long Wave Radiation, Lunar Occultation, Radiation Distribution, Radio Astronomy Explorer Satellite, Radio Occultation, Spatial Distribution, Terrestrial Radiation, Diurnal Variations, Electron Precipitation, Geomagnetic Tail, Magnetosheath, Magnetospheric Instability, Plasma-Particle Interactions, Solar Wind

Scientific paper

Observations of lunar occultations of earth at 250 kHz, obtained with the Radio Astronomy Explorer 2 satellite, have been used to derive two-dimensional maps of the location of the sources of terrestrial kilometric radiation (TKR). By examining the two-dimensional source distributions as a function of the observer's location (lunar orbit) with respect to the magnetosphere, the average three-dimensional location of the emission regions can be estimated. Although TKR events at 250 kHz can often be observed at projected distances corresponding to the 250-kHz electron gyro or plasma level (about 2 earth radii), many events are observed much farther from earth (about 5 to 15 radii). On the dayside, emission was apparently observed in the region of the polar cusp and the magnetosheath at a magnetic latitude of about 70 deg; in the night hemisphere, emission is found to be associated with regions of the magnetotail at latitudes of at least 70 deg. The nightside emission is suggestive of a mechanism involving plasma-sheet electron precipitation in the premidnight sector.

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