Plasma Boundary Locations as Measured Simultaneously by Rosetta and Mars Express

Details Plasma Boundary Locations as Measured Simultaneously by Rosetta and Mars Express Plasma Boundary Locations as Measured Simultaneously by Rosetta and Mars Express

Sep 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008dps....40.1409e&link_type=abstract

American Astronomical Society, DPS meeting #40, #14.09; Bulletin of the American Astronomical Society, Vol. 40, p.408

Astronomy and Astrophysics

Astronomy

Scientific paper

We present the first two-spacecraft simultaneous observations of the Martian bow shock (BS) and magnetic pileup boundary (MPB), obtained by the plasma instruments onboard Rosetta and Mars Express during the Rosetta Mars flyby on February 25, 2007. We compare the positions of these two boundaries with models based on previous measurements by Mars Global Surveyor. The BS is found to be compressed despite a low solar wind dynamical pressure whereas the MPB is found at its average position. We also show the result of a single case study of the effects of extreme solar wind conditions on the location of the above boundaries. A long-lasting ( 24 hours) solar wind structure with high magnetic field strength and variability as well as high solar wind density and velocity is observed in Rosetta (far downtail of Mars) and Mars Express (close to the terminator) data simultaneously. The fortunate orbital configuration of Mars Express at this time makes it possible to observe how the BS and MPB becomes asymmetric during the passage of this solar wind structure: the BS and MPB observed in the southern/dawn hemisphere is found significantly further out than in the northern/dusk hemisphere.

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