Physics
Scientific paper
Jan 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001natur.409..313g&link_type=abstract
Nature, Volume 409, Issue 6818, pp. 313-315 (2001).
Physics
31
Scientific paper
The detection of impulsive low-frequency (10 to 80kHz) radio signals, and separate very-low-frequency (~100Hz) radio `whistler' signals provided the first evidence for lightning in the atmosphere of Venus. Later, a small number of impulsive high-frequency (100kHz to 5.6MHz) radio signals, possibly due to lightning, were also detected. The existence of lightning at Venus has, however, remained controversial. Here we report the results of a search for high-frequency (0.125 to 16MHz) radio signals during two close fly-bys of Venus by the Cassini spacecraft. Such signals are characteristic of terrestrial lightning, and are commonly heard on AM (amplitude-modulated) radios during thunderstorms. Although the instrument easily detected signals from terrestrial lightning during a later fly-by of Earth (at a global flash rate estimated to be 70s -1, which is consistent with the rate expected for terrestrial lightning), no similar signals were detected from Venus. If lightning exists in the venusian atmosphere, it is either extremely rare, or very different from terrestrial lightning.
Averkamp T. F.
Farrell William M.
Gurnett Donald A.
Hospodarsky George B.
Kaiser Michael L.
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