Interplanetary dust distribution and temporal variability of Mercury's atmospheric Na

Shingo Kameda, Ichiro Yoshikawa, Masato Kagitani, Shoichi Okano

Research output: Contribution to journalArticlepeer-review

22 Citations (Scopus)

Abstract

The interplanetary dust (IPD) distribution in the inner solar system is not yet well understood because of lack of direct dust measurements in the inner solar system and so one needs to rely on zodiacal light observations that are difficult to interpret. Mercury has an unstable atmosphere, and the source processes of Na in its atmosphere are unclear. Results of past observations have revealed that the atmospheric Na density has no or low correlation with the solar flux, sunspot number, heliocentric distance, or solar radiation pressure. We show that the variability of Mercury's atmospheric Na density depends strongly on the IPD distribution. That is, Na density is low (high) when Mercury is far away from (close to) the symmetry plane of IPD, and so one can infer the IPD distribution near Mercury orbit from the temporal variability of Na density in Mercury s atmosphere.

Original languageEnglish
Article numberL15201
JournalGeophysical Research Letters
Volume36
Issue number15
DOIs
Publication statusPublished - 2009 Aug 16

ASJC Scopus subject areas

  • Geophysics
  • Earth and Planetary Sciences(all)

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