First optical observation of the moon's sodium exosphere from the lunar orbiter SELENE (Kaguya)

M. Kagitani, M. Taguchi, A. Yamazaki, I. Yoshikawa, G. Murakami, K. Yoshioka, S. Kameda, F. Ezawa, T. Toyota, Shouichi Okano

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)1025-1029
Number of pages5
Journalearth, planets and space
Volume61
Issue number8
DOIs
Publication statusPublished - 2009

Keywords

  • Geminid meteor shower
  • Lunar orbiter SELENE
  • Lunar sodium exosphere
  • Resonant scattering emission

ASJC Scopus subject areas

  • Geology
  • Space and Planetary Science

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    Kagitani, M., Taguchi, M., Yamazaki, A., Yoshikawa, I., Murakami, G., Yoshioka, K., Kameda, S., Ezawa, F., Toyota, T., & Okano, S. (2009). First optical observation of the moon's sodium exosphere from the lunar orbiter SELENE (Kaguya). earth, planets and space, 61(8), 1025-1029. https://doi.org/10.1186/BF03352953