Detection of visible lightning on Saturn

Until now, evidence for lightning on Saturn has been indirect – through radio emissions and cloud morphology. Here we report the first visible detection of lightning, on the night side on August 17, 2009 at −36.4° ± 0.1° planetocentric latitude and 10.6° ± 0.9° west longitude. No other locations pro...

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Veröffentlicht in:Geophysical research letters 2010-05, Vol.37 (9), p.n/a
Hauptverfasser: Dyudina, U. A., Ingersoll, A. P., Ewald, S. P., Porco, C. C., Fischer, G., Kurth, W. S., West, R. A.
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container_end_page n/a
container_issue 9
container_start_page
container_title Geophysical research letters
container_volume 37
creator Dyudina, U. A.
Ingersoll, A. P.
Ewald, S. P.
Porco, C. C.
Fischer, G.
Kurth, W. S.
West, R. A.
description Until now, evidence for lightning on Saturn has been indirect – through radio emissions and cloud morphology. Here we report the first visible detection of lightning, on the night side on August 17, 2009 at −36.4° ± 0.1° planetocentric latitude and 10.6° ± 0.9° west longitude. No other locations produced lightning detectable by either imaging or radio. The lightning images are consistent with a single cloud flashing once per minute. The visible energy of a single flash is comparable to that on Earth and Jupiter, and ranges up to 1.7 × 109 Joules. The diameter of the lightning flashes is ∼200 km, which suggests the lightning is 125–250 km below cloud tops. This depth is above the base of the liquid H2O‐NH3 cloud and may be either in the NH4SH cloud or in the H2O ice cloud. Saturn's lower internal heat transport and likely 5–10 fold enrichment of water largely explain the lower occurrence rate of moist convection on Saturn relative to Jupiter.
doi_str_mv 10.1029/2010GL043188
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source Elektronische Zeitschriftenbibliothek - Frei zugängliche E-Journals; Access via Wiley Online Library; Wiley-Blackwell AGU Digital Library; Wiley Online Library (Open Access Collection)
subjects Atmosphere
Atmospheric sciences
Clouds
Earth sciences
Earth, ocean, space
Enrichment
Exact sciences and technology
Flashing
Heat transport
Jupiter
Lightning
Lightning flashes
Meteorology
planetary atmospheres
Planetology
Planets
Saturn
title Detection of visible lightning on Saturn
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