Nondetection of Titan lightning radio emissions with Cassini/RPWS after 35 close Titan flybys

被引：20
作者：
Fischer, G.
Gurnett, D. A.
Kurth, W. S.
Farrell, W. M.
Kaiser, M. L.
Zarka, P.
机构：
[1] Univ Iowa, Dept Phys & Astron, Iowa City, IA 52242 USA
[2] NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA
[3] Observ Paris, Paris, France
来源：
GEOPHYSICAL RESEARCH LETTERS | 2007年 / 34卷 / 22期
关键词：
D O I：
10.1029/2007GL031668
中图分类号：
P [天文学、地球科学];
学科分类号：
07 ;
摘要：
We report on the nondetection of radio emissions associated with possible lightning flashes in Titan's atmosphere by the Cassini/RPWS ( Radio and Plasma Wave Science) instrument. A valid proof for Titan lightning would be the detection of a number of bursty radio signals above Titan's ionospheric cutoff frequency, and they should be grouped near the closest approach of Cassini to Titan with an approximately quadratic fall off of signal intensity with spacecraft distance. Such a clear signature has not been detected by the RPWS instrument during the first 35 close flybys of Titan.
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页数：5
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