X-ray observation of mars at solar minimum with Suzaku

Kumi Ishikawa, Yuichiro Ezoe, Takaya Ohashi, Naoki Terada, Yoshifumi Futaana

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

Abstract

Mars was observed in X-rays during 2008 April 3-5 for 82 ks with the Japanese Suzaku observatory. Mars has been known to emit X-rays via the scattering of solar X-rays and via charge exchange between neutral atoms in the exosphere and solar-wind ions. Past theoretical studies suggest that the exospheric neutral density may vary by a factor of up to 10 over the solar cycle. To investigate a potential change of the exospheric charge exchange emission, Mars was observed with Suzaku at solar minimum. Significant signals were not detected at the position of Mars in the energy band of 0.2-5 keV. The 2 σ upper limit of the OVII line flux in 0.5-0.65 keV was 4.3 × 10-5 photonscm-2 s-1. Comparing this upper limit to past Chandra and XMM-Newton observations conducted near solar maximum, it was found that the exospheric density at solar minimum does not exceed that near solar maximum by more than 6-70 times.

Original languageEnglish
Pages (from-to)S705-S712
JournalPublications of the Astronomical Society of Japan
Volume63
Issue numberSPEC. ISSUE 3
DOIs
Publication statusPublished - 2011 Nov 25

Keywords

  • Planets and satellites: Individual (Mars)
  • X-rays: Individual (Mars)

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Fingerprint

Dive into the research topics of 'X-ray observation of mars at solar minimum with Suzaku'. Together they form a unique fingerprint.

Cite this