NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Venus bow shocks at unusually large distances from the planetRecent analysis of data from the Pioneer Venus Orbiter (PVO) has shown that the bow shock often travels to unusually large distances from the planet when the solar wind magnetosonic Mach number is near unity. We suggest that distant bow shocks can be explained as an integral part of the response of the global solar wind/Venus interaction to the anomalous local solar wind conditions that existed during the time of these observations. The lower-than-normal plasma beta and magnetosonic Mach number are in a parameter regime for which the usual fast-mode bow shock close to the planet may not provide the necessary compression and deflection of the solar wind. Using MHD simulations we show that, for these conditions, the usual fast shock is replaced by a bow shock consisting of an intermediate shock near the Sun-Venus line and a fast shock at large distances from the Sun-Venus line. This composite bow shock propagates upstream away from the planet at a low speed and appears to be approaching a new equilibrium stand-off location at a large distance from the planet.
Document ID
19930051383
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Steinolfson, R. S.
(NASA Ames Research Center Moffett Field, CA, United States)
Cable, S.
(Southwest Research Inst. San Antonio, TX, United States)
Date Acquired
August 16, 2013
Publication Date
April 23, 1993
Publication Information
Publication: Geophysical Research Letters
Volume: 20
Issue: 8
ISSN: 0094-8276
Subject Category
Lunar And Planetary Exploration
Accession Number
93A35380
Funding Number(s)
CONTRACT_GRANT: NAG2-692
Distribution Limits
Public
Copyright
Other

Available Downloads

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