Physics
Scientific paper
Nov 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004p%26ss...52.1169b&link_type=abstract
Planetary and Space Science, Volume 52, Issue 13, p. 1169-1175.
Physics
10
Scientific paper
Analysis of three spectra of the exosphere of Mercury in the Na-D lines are presented. Spectra were secured with the high-resolution spectrograph (SARG) of the 3.5 M Telescopio Nazionale Galileo (TNG, located on the Roque de los Muchachos, Canaries) on the evenings of August 23 and 24, 2002. Spectra have resolution R=115000; the slit length was 26.7”. The Na column abundances range from 4.3 to 19.7×10atoms/cm with the highest abundances being close to the illuminated limb. Our observations at true anomaly angles (TAA) from 171°to 174°show the traces of the emission lines to be strongly peaked at the illuminated limb, supportive of recent modeling that shows thermal desorption to be a strong factor in determining the distribution of Na about the planet.
Barbieri Cesare
Cosentino Rosario
Cremonese Gabriele
Hunten Donald
Mendillo Michael
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