Plasma observations of magnetopause crossing at geosynchronous orbit

Details Plasma observations of magnetopause crossing at geosynchronous orbit Plasma observations of magnetopause crossing at geosynchronous orbit

Nov 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994jgr....9921249m&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 99, no. A11, p. 21,249-21,255

Physics

23

Density Distribution, Geosynchronous Orbits, Magnetopause, Magnetosheath, Plasma Density, Satellite Observation, Solar Wind, Analyzers, Goes Satellites, Spectrograms, Synchronous Satellites

Scientific paper

The entire three-spacecraft magnetospheric plasma analyzer (MPA) data set has been examined for intervals of magnetosheath plasma at geosynchronous orbit. Over the 6 1/2 spacecraft years of data reviewed, 916 5-min intervals of magnetosheath plasma observations were identified and cataloged. Unlike previous studies that suggested that magnetopause encounters were far more likely on the prenoon than postnoon side at geosynchronous orbit, this study examines three independent lines of evidence and finds that only a small asymmetry (in this same sense) exists. On a statistical basis, a local time of approximately 1130 is both the median and mean for out magnetosheath observations; this local time is simply consistent with the effects of an aberrated solar wind direction due to the motion of the Earth around the Sun. Simultaneous multipoint observations across both sides of local noon are also consistent with a small offset due to aberration of the magnetopause. Finally, we examine the locations of the dawn-dusk flow reversals for a number of cases where one of the geosynchronous spacecraft was outside the magnetopause in the magnetosheath flow. These flow reversals tended to occur near local noon, again indicating that in contrast to previous findings, no large asymmetry exists.

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