Physics
Scientific paper
Feb 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979p%26ss...27..127k&link_type=abstract
Planetary and Space Science, vol. 27, Feb. 1979, p. 127-130.
Physics
Equatorial Atmosphere, Extremely Low Frequencies, Ionospheric Propagation, Spread F, Ionospheric Disturbances, Ogo-6, Satellite Observation
Scientific paper
Extreme low frequency electromagnetic waves have been observed below the F peak in the equatorial ionosphere by instruments onboard OGO-6. Electrostatic wave observations indicate that the steep gradient was unstable to the process which causes equatorial spread F above the region where the electromagnetic waves were observed. The data are very similar to observations near the polar cusp and give further evidence that ELF waves are excluded from regions of rapid and irregular density increases. Low level electromagnetic waves with similar properties were occasionally observed on the nightside by the OVI-17 electric field sensor and may be plasmaspheric hiss which has propagated to low altitude.
Holtet J. A.
Kelley Michael C.
Tsurutani Bruce T.
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