Physics
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufm.p11b1211j&link_type=abstract
American Geophysical Union, Fall Meeting 2009, abstract #P11B-1211
Physics
[5405] Planetary Sciences: Solid Surface Planets / Atmospheres
Scientific paper
The MAVEN mission has the goal of understanding the current structure and composition of the Mars upper atmosphere, the present-day rates of loss of atmosphere to space, and the dependence on solar and solar-wind input that will allow extrapolation backward in time. It will determine the total loss of volatiles to space through time, and therefore determine the role of loss to space in the changes in Mars climate that have occurred. Launch will be in November 2013, with orbit insertion at Mars in September 2014 and start of the one-Earth-year mapping mission in October 2014. The primary mission occurs during the declining phase of the solar cycle, and we should observe significant variation in the solar EUV flux and solar-storm events that drive upper-atmospheric behavior. Eight instruments on board the spacecraft provide detailed measurements of the neutral and ion composition and structure, EUV and solar-energetic-particle inputs into the upper atmosphere, energetic ions, solar-wind electrons and ions, electron abundance and temperature, and the magnetic field. The spacecraft will observe from an elliptical orbit that carries it through all regions of the upper atmosphere and near-Mars space, and allows both in situ and remote-sensing observations of the local and global properties of the upper atmosphere. The precessing orbit carries periapsis through all local solar times and most latitudes, providing thorough coverage. MAVEN is a Principal Investigator led mission in the Mars Scout line. Partners include NASA's Goddard Space Flight Center (providing project management and oversight, two instruments, and the Project Scientist), University of Colorado (two instruments, the science operations center, and education and public outreach lead), University of California at Berkeley (four instruments and the Deputy P.I.), NASA's Jet Propulsion Laboratory (navigation and the deep-space network), and science co-investigators at a number of additional institutions. Additional hardware is being provided by CESR in France. The project passed its Systems Requirements Assessment in August 2009, and the next major milestone is Preliminary Design Review in July 2010.
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