Mathematics – Logic
Scientific paper
Oct 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011epsc.conf.1618s&link_type=abstract
EPSC-DPS Joint Meeting 2011, held 2-7 October 2011 in Nantes, France. http://meetings.copernicus.org/epsc-dps2011, p.1618
Mathematics
Logic
Scientific paper
Studies of the surface in the near infrared have shown several areas of recent geologic activity. These areas correspond well to the suspected 'hot spots' previously identified in the Magellan radar and gravity field maps. Recently the atmospheric density has been probed in situ by reducing the pericentre altitude such that the drag force on the spacecraft has become significant and thus measureable. In this way the altitude range 165-200 km, which is not possible to address with remote measurements, has been characterized. For the first time a new technique has been applied whereby the solar panels are set in an asymmetric position with respect to each other such that a torque is acting on the spacecraft during the atmospheric pass. Since the spacecraft attitude is maintained automatically be the reaction wheels the rotation rate changes of the wheels provide a very sensitive measure of the atmospheric density.
Svedhem Håkan
Titov Dimitry
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