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Upstream waves at MarsWeak, about 0.15 nT, narrow band emissions at the proton gyro frequency are observed by the Phobos magnetometer MAGMA, upstream from the bow shock of Mars. These waves are left-hand elliptically polarized. They may be associated with the pick up of protons from the Martian hydrogen exosphere. Strong turbulence, similar to that observed at the terrestrial bow shock, is found on occasion in the upstream region when the IMF connects to the bow shock. On two occasions this turbulence occurred when the spacecraft crossed the orbit of Phobos. This coincidence raises the possibility that material in the orbits of Phobos interacts with the solar wind in such a way to either affect the direction of the IMF or to cause instabilities in the solar wind plasma. However, since on a third occasion these waves did not occur, these waves may be shock associated rather than Phobos associated.
Document ID
19920069527
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Russell, C. T.
(NASA Headquarters Washington, DC United States)
Luhmann, J. G.
(California, University Los Angeles, United States)
Schwingenschuh, K.
(NASA Headquarters Washington, DC United States)
Riedler, W.
(Oesterreichische Akademie der Wissenschaften Institut fuer Weltraumforschung, Graz, Austria)
Eroshenko, E.
(IZMIRAN Troitsk, Russia)
Date Acquired
August 15, 2013
Publication Date
September 1, 1992
Publication Information
Publication: Advances in Space Research
Volume: 12
Issue: 9 Se
ISSN: 0273-1177
Subject Category
Lunar And Planetary Exploration
Accession Number
92A52151
Funding Number(s)
CONTRACT_GRANT: NAGW-717
CONTRACT_GRANT: NAGW-1753
Distribution Limits
Public
Copyright
Other

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