Terrestrial kilometric radiation. II - Emission from the magnetospheric cusp and dayside magnetosheath

Details Terrestrial kilometric radiation. II - Emission from the magnetospheric cusp and dayside magnetosheath Terrestrial kilometric radiation. II - Emission from the magnetospheric cusp and dayside magnetosheath

Jan 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977jgr....82...98a&link_type=abstract

Journal of Geophysical Research, vol. 82, Jan. 1, 1977, p. 98-104.

Astronomy and Astrophysics

Astronomy

5

Explorer 2 Satellite, Low Frequencies, Magnetosheath, Magnetospheric Instability, Polar Regions, Solar Wind, Terrestrial Radiation, Atmospherics, Auroral Electrojets, Daytime, Interplanetary Magnetic Fields, Lunar Occultation, Plasma-Particle Interactions, Polar Caps, Radial Distribution

Scientific paper

Measurements of the location of sources of terrestrial kilometric radiation obtained with the lunar-orbiting Radio Astronomy Explorer 2 satellite have revealed a class of emission associated with the cusp and dayside magnetosheath. At frequencies near 250 kHz, this emission is observed at radial distances between 2 and 20 earth radii at magnetic latitudes of 75 to 80 deg and is most often detected during periods of auroral activity and southward orientation of the interplanetary magnetic-field vertical component. During very disturbed times, the emission at the lowest frequencies (below about 200 kHz) appears to come from the dayside magnetosheath at distances of at least 12 earth radii. Whenever the geomagnetic dipole is tilted significantly with respect to the ecliptic pole, the cusp emission is confined to the hemisphere containing the subsolar point. The measurements also suggest that the region of cusp emission is rather narrowly confined in longitude to within a few hours of the noon meridian.

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