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Neutral upper atmosphere structure

โœ Scribed by Keating, Gerald M.

Book ID
119698058
Publisher
American Geophysical Union
Year
1971
Tongue
English
Weight
976 KB
Volume
52
Category
Article
ISSN
0096-3941

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High-resolution spectroscopic measurements of Mercury were made at \(4227 \AA\) to search for neutral calcium in the atmosphere. An upper limit to the intensity is \(9.0 \mathrm{kR}\); the corresponding \(\mathrm{Ca}\) column abundance is \(<7.4 \times 10^{8}\) atoms \(\mathrm{cm}^{-2}\) with a \(\m