NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Impulsive signals in the night ionosphere of Venus - Comparison of results obtained below the local electron gyro frequency with those aboveImpulsive VLF signals at low altitudes in the night ionosphere of Venus occur both above and below the electron gyro frequency. The strength of the magnetic field has a very strong influence on the occurrence rates of these impulsive emissions at all frequencies. Above about one-quarter of the local electron gyro frequency the waves occur most frequently for strong magnetic fields and much less frequently for weak fields. However, below about one-quarter of the electron gyro frequency, the occurrence rate is much less sensitive to field strength. At all frequencies the occurrence rate depends little on the direction of the magnetic field. The occurrence rate is strongly dependent on local time especially above the electron gyro frequency. Here, the occurrence rate peaks sharply at 2100 LT. Below the local electron gyro frequency the occurrence rate also shows a maximum near 2100 LT but decreases much more slowly with increasing local time. The rate of occurrence of low frequency signals varies little with altitude but the occurrence of the higher frequency signals decreases rapidly. These properties are consistent with a broadband source of VLF waves in the Venus atmosphere such as would be provided by intracloud lightning.
Document ID
19900030851
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Russell, C. T.
(California Univ. Los Angeles, CA, United States)
Von Dornum, M.
(California Univ. Los Angeles, CA, United States)
Scarf, F. L.
(California, University Los Angeles, United States)
Date Acquired
August 14, 2013
Publication Date
January 1, 1990
Publication Information
Publication: Advances in Space Research
Volume: 10
Issue: 5 19
ISSN: 0273-1177
Subject Category
Lunar And Planetary Exploration
Accession Number
90A17906
Funding Number(s)
CONTRACT_GRANT: NAG2-501
CONTRACT_GRANT: NAGW-995
Distribution Limits
Public
Copyright
Other

Available Downloads

There are no available downloads for this record.
No Preview Available