Sodium velocity maps on Mercury

Details Sodium velocity maps on Mercury Sodium velocity maps on Mercury

Oct 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011epsc.conf..337p&link_type=abstract

EPSC-DPS Joint Meeting 2011, held 2-7 October 2011 in Nantes, France. http://meetings.copernicus.org/epsc-dps2011, p.337

Computer Science

Scientific paper

Sodium atoms in the exosphere of Mercury experience radiation pressure, at levels depending on radial velocity of Mercury. As a result, sodium atoms are accelerated in the anti-sunward direction over the surface of Mercury. The Earthwardpointing component of their velocity is measurable as a Doppler shift of the sodium emission line from the position expected from the Mercury-Earth relative velocity. We have mapped these velocity vectors over the surface of Mercury, expecting that irregularities in the flow could signal the existence of sodium sources or sinks on the surface. Velocity variations in the southern Mercury hemisphere on April 09, 2010 suggested that sodium sources existed there.

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