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EBSCO Psychology and Behavioral Sciences Collection
Beschreibungen/Notizen
The detection of impulsive low-frequency (10 to 80 kHz)
radio signals, and separate very-low-frequency (∼100 Hz) radio
'whistler' signals provided the first evidence
for lightning in the atmosphere of Venus. Later, a small number of impulsive
high-frequency (100 kHz to 5.6 MHz) 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 16 MHz)
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 70 s
-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.