Physics
Scientific paper
Jul 1974
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974sci...185..166b&link_type=abstract
Science, Volume 185, Issue 4146, pp. 166-169
Physics
36
Scientific paper
Analysis of data obtained by the ultraviolet experiment on Mariner 10 indicates that Mercury is surrounded by a thin atmosphere consisting in part of helium. The partial pressure of helium at the terminator is about 5 × 10-12 millibar. The total surface pressure of the atmosphere is less than about 2 × 10-9 millibar. Upper limits are set for the abundance of various gases, including hydrogen, oxygen, carbon, argon, neon, and xenon. The wavelength dependence of Mercury's surface albedo is similar to that of the moon over a broad range of wavelengths from 500 to 1600 angstroms. Strong signals were recorded by the airglow instrument as Mariner 10 passed through the cavity behind Mercury. They are as yet unexplained but may provide information on the properties of the local plasma.
Belton Michael J. S.
Broadfoot Lyle A.
Kumar Sanjeev
McElroy Michael B.
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