Computer Science – Sound
Scientific paper
Dec 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984georl..11.1168k&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 11, Dec. 1984, p. 1168-1171.
Computer Science
Sound
10
Atmospheric Electricity, Equatorial Atmosphere, F Region, Magnetohydrodynamic Stability, Spread F, Thunderstorms, Balloon Sounding, Electric Fields, Ionospheric Drift, Lightning
Scientific paper
Explosive spread F was first described by Woodman and LaHoz (1976). In such events the 50 MHz radar signal rises at Jicamarca to 10-20 dB above the noise level within a few milliseconds but then disappears within 100 ms or less. It has been suggested that electric fields from thunderstorms might drive a plasma instability which could cause these echoes, and recent observations (Woodman and Kudeki, 1984) provide convincing evidence for this triggering. Here, the instability mechanism is discussed and it is shown that transient thunderstorm electric fields comparable to those recently observed by rockets in the midlatitude ionosphere could excite a rapidly growing two-stream plasma instability that is driven by the ExB drift of the F region electrons in the short period (less than the ion gyroperiod) before the ions reach the same velocity.
Farley Donald T.
Kelley Michael C.
Kudeki Erhan
Siefring Carl L.
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