Physics
Scientific paper
Feb 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988georl..15..176s&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 15, Feb. 1988, p. 176-179.
Physics
16
Kilometric Waves, Radio Emission, Satellite Observation, Solar Wind, Terrestrial Radiation, Auroral Zones, Nonthermal Radiation, Spectrum Analysis
Scientific paper
At a time when the AE index was 1300, the radio receivers on ISEE-3 (216 earth radii sunward of earth) and ISEE-1 recorded a new type of terrestrial radio emission between 20 and 50 kHz. The radiation had a smooth time profile with a negative frequency drift; its angular diameter at 47 kHz was at least 170 deg. This smooth component followed the onset of a TKR burst whose angular diameter was 50 deg at the same frequency (47 kHz) and varied as 1/f squared; i.e., it was controlled by interplanetary scattering. Because of its time association with the TKR burst, the source of the smooth radiation must have been in the earth environment. It is suggested that it was produced or leaked into the interplanetary medium very far from earth in order that the scatteirng path to ISEE-3 be long enough (2000 earth radii) to account for the observed angular diameter. More than 50 such events, clearly distinct from the earth nonthermal continuum, were observed between 1978 and 1983.
Hoang Sang
Lacombe Catherine
Steinberg Jean-Louis
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