TY - JOUR
T1 - Enhancement of terrestrial diffuse X-ray emission associated with coronal mass ejection and geomagnetic storm
AU - Ezoe, Yuichiro
AU - Miyoshi, Yoshizumi
AU - Yoshitake, Hiroshi
AU - Mitsuda, Kazuhisa
AU - Terada, Naoki
AU - Oishi, Shihoko
AU - Ohashi, Takaya
PY - 2011/11/25
Y1 - 2011/11/25
N2 - 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.
AB - 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.
KW - Earth
KW - Sun: Solar wind
KW - Sun: Solar-terrestrial relations
KW - X-rays: Diffuse background
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U2 - 10.1093/pasj/63.sp3.s691
DO - 10.1093/pasj/63.sp3.s691
M3 - Article
AN - SCOPUS:82555200909
SN - 0004-6264
VL - 63
SP - S691-S704
JO - Publications of the Astronomical Society of Japan
JF - Publications of the Astronomical Society of Japan
IS - SPEC. ISSUE 3
ER -