First optical observation of the Moon’s sodium exosphere from the lunar orbiter SELENE (Kaguya)

The first successful observations of resonant scattering emission from the lunar sodium exosphere were made from the lunar orbiter SELENE (Kaguya) using TVIS instruments during the period 17–19 December, 2008. The emission intensity of the NaD-line decreased by 12±6%, with an average value of 5.4 kR...

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Published in:Earth, planets, and space planets, and space, 2009-01, Vol.61 (8), p.1025-1029
Main Authors: Kagitani, M., Taguchi, M., Yamazaki, A., Yoshikawa, I., Murakami, G., Yoshioka, K., Kameda, S., Ezawa, F., Toyota, T., Okano, S.
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Language:English
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Earth and Environmental Science
Earth Sciences
Geology
Geophysics/Geodesy
Letter
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creator Kagitani, M.
Taguchi, M.
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Toyota, T.
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description The first successful observations of resonant scattering emission from the lunar sodium exosphere were made from the lunar orbiter SELENE (Kaguya) using TVIS instruments during the period 17–19 December, 2008. The emission intensity of the NaD-line decreased by 12±6%, with an average value of 5.4 kR (kilorayleighs) in this period, which was preceded, by 1 day, by enhancement of the solar proton flux associated with a corotating interaction region. The results suggest that solar wind particles foster the diffusion of sodium atoms or ions in the lunar regolith up to the surface and that the time scale of the diffusion is a few tens of hours. The declining activity of the Geminid meteor shower is also one possible explanation for the decreasing sodium exosphere.
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subjects Earth and Environmental Science
Earth Sciences
Geology
Geophysics/Geodesy
Letter
title First optical observation of the Moon’s sodium exosphere from the lunar orbiter SELENE (Kaguya)
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