Enhancement of terrestrial diffuse X-ray emission associated with coronal mass ejection and geomagnetic storm

Yuichiro Ezoe, Yoshizumi Miyoshi, Hiroshi Yoshitake, Kazuhisa Mitsuda, Naoki Terada, Shihoko Oishi, Takaya Ohashi

Research output: Contribution to journalArticlepeer-review

16 Citations (Scopus)

Abstract

We present an analysis of a Suzaku observations taken during the geomagnetic storm of 2005 August 23-24. We found a time variation of diffuse soft X-ray emission when a coronal mass ejection hit Earth and caused a geomagnetic storm. The diffuse emission consisted of fluorescent scattering of solar X-rays and an exospheric solar wind charge exchange. The former is characterized by a neutral oxygen emission line due to strong heating of the upper atmosphere during the storm time, while the latter is dominated by the sum of C V, CVI, NVI, NVII, OVII, andOVIII emission lines due to an enhanced solar wind flux in the vicinity of the exosphere. Using the solar-wind data taken with the ACE andWIND satellites, a time correlation between the solar wind and the strong OVII line flux was investigated. We estimated necessary column densities for the solar X-ray scattering and exospheric SWCX. From these results, we argue that a part of the solar-wind ions enters inside the magnetosphere and causes the SWCX reaction.

Original languageEnglish
Pages (from-to)S691-S704
JournalPublications of the Astronomical Society of Japan
Volume63
Issue numberSPEC. ISSUE 3
DOIs
Publication statusPublished - 2011 Nov 25

Keywords

  • Earth
  • Sun: Solar wind
  • Sun: Solar-terrestrial relations
  • X-rays: Diffuse background

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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