Journal article
Analysis of a giant lightning storm on Saturn
Icarus (New York, N.Y. 1962), Vol.190(2), pp.528-544
10/01/2007
DOI: 10.1016/j.icarus.2007.04.002
Abstract
On January 23, 2006, the Cassini/RPWS (Radio and Plasma Wave Science) instrument detected a massive outbreak of SEDs (Saturn Electrostatic Discharges). The following SED storm lasted for about one month and consisted of 71 consecutive episodes. It exceeded all other previous SED observations by Cassini as well as by the Voyagers with regard to number and rate of detected events. At the same time astronomers at the Earth as well as Cassini/ISS (Imaging Science Subsystem) detected a distinctive bright atmospheric cloud feature at a latitude of 35° South, strongly confirming the current interpretation of SEDs being the radio signatures of lightning flashes in Saturn's atmosphere. In this paper we will analyze the main physical properties of this SED storm and of a single small SED storm from 2005. The giant SED storm of 2006 had maximum burst rates of 1 SED every 2 s, its episodes lasted for 5.5 h on average, and the episode's periodicity of about 10.66 h exactly matched the period of the ISS observed cloud feature. Using the low frequency cutoff of SED episodes we determined an ionospheric electron density around 10 cm for the dawn side of Saturn.
Details
- Title: Subtitle
- Analysis of a giant lightning storm on Saturn
- Creators
- Georg Fischer - University of IowaWilliam S. Kurth - University of IowaUlyana A. Dyudina - California Institute of TechnologyMichael L. Kaiser - Goddard Space Flight CenterPhilippe Zarka - Observatoire de ParisAlain Lecacheux - Observatoire de ParisA. P. Ingersoll - California Institute of TechnologyDonald A. Gurnett - University of Iowa
- Resource Type
- Journal article
- Publication Details
- Icarus (New York, N.Y. 1962), Vol.190(2), pp.528-544
- Publisher
- Elsevier
- DOI
- 10.1016/j.icarus.2007.04.002
- ISSN
- 0019-1035
- eISSN
- 1090-2643
- Language
- English
- Date published
- 10/01/2007
- Academic Unit
- Physics and Astronomy
- Record Identifier
- 9984455262702771
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