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Pervasive large-scale magnetic fields in the Venus nightside ionosphere and their implicationsWhen the solar wind dynamic pressure at Venus was extraordinarily high during the primary mission of the Pioneer Venus Orbiter (PVO), 'disappearing ionospheres' occurred on the nightside, with accompanying pervasive near-periapsis magnetic fields of tens of nanoteslas. These nightside counterparts of the generally horizontal large-scale magnetic fields in the dayside ionosphere are found to exhibit some dependence of field magnitude on the solar wind pressure but not on solar zenith angle. Their statistical behavior suggests a global configuration in which the low-altitude field wraps around the planet, while the field at higher altitudes is draped like the induced magnetotail field. The toroidal low-altitude field geometry implies the possible existence of magnetic x points in the low-altitude wake.
Document ID
19920054371
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Luhmann, J. G.
(California, University Los Angeles, United States)
Date Acquired
August 15, 2013
Publication Date
April 25, 1992
Publication Information
Publication: Journal of Geophysical Research
Volume: 97
Issue: E4 A
ISSN: 0148-0227
Subject Category
Lunar And Planetary Exploration
Accession Number
92A36995
Funding Number(s)
CONTRACT_GRANT: NAG2-501
Distribution Limits
Public
Copyright
Other

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