Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jgr....9619043k&link_type=abstract
Journal of Geophysical Research Supplement (ISSN 0148-0227), vol. 96, Oct. 30, 1991, p. 19,043-19,047.
Astronomy and Astrophysics
Astronomy
11
Atmospheric Electricity, Atmospherics, Lightning, Neptune Atmosphere, Planetary Meteorology, Ammonia, Atmospheric Composition, Plasma Waves, Radio Astronomy, Voyager 2 Spacecraft, Whistlers
Scientific paper
Although lightning-triggered whistlers were detected by the Voyager 2 plasma wave experiment at Neptune, only four possible lightning sferics were detected by the planetary radio astronomy instrument. This low level of detection places strict limits on the characteristics of Neptunian lightning, ruling out lightning with power levels as high as those observed at Saturn or Uranus, but leaving the intriguing possibility that lightning slightly stronger than normal terrestrial lightning flashes but with much lower occurrence rate could exist. Possible scenarios to explain the observations are examined, including reduced NH3 concentration in the planet's atmosphere and an unusually slow risetime discharge process.
Desch Michael D.
Farrell William M.
Kaiser Michael L.
Zarka Ph.
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