Enhancement of Terrestrial Diffuse X-ray Emission Associated With Coronal Mass Ejection and Geomagnetic Storm

Abstract

We present an analysis of a Suzaku observation taken during the geomagnetic storm of 2005 August 23-24. We found time variation of diffuse soft X-ray emission when a coronal mass ejection hit Earth and caused a geomagnetic storm. The diffuse emission consists of fluorescent scattering of solar X-rays and exospheric solarwind 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 a sum of C V, C VI, N VI, N VII, O VII, and O VIII emission lines due to the enhanced solar wind flux in the vicinity of the exosphere. Using the solar wind data taken with the ACE and WIND satellites,a time correlation between the solar wind and the strong O VII line flux were 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 enter inside the magnetosphere and cause the SWCX reaction.

33 pages, 16 figures, accepted for publication in PASJ

References in corpus (4)

• OVII and OVIII line emission in the diffuse soft X-ray background: heliospheric and galactic contributions
• Identifying XMM-Newton observations affected by solar wind charge exchange - Part I
• Identifying XMM-Newton observations affected by solar wind charge exchange - Part II
• The Solar Wind Charge-eXchange contribution to the Local Soft X-ray Background. Model to data comparison in the 0.1-1.0 keV band

Cited by in corpus (10)

• An XMM-Newton Survey of the Soft X-ray Background. III. The Galactic Halo X-ray Emission
• The Interaction of the Fermi Bubbles with the Milky Way's Hot Gas Halo
• Solar Wind Charge Exchange: An Astrophysical Nuisance
• An XMM-Newton Survey of the Soft X-ray Background. II. An All-Sky Catalog of Diffuse O VII and O VIII Emission Intensities
• Suzaku detection of enigmatic geocoronal solar wind charge exchange event associated with coronal mass ejection
• Suzaku Detection of Solar Wind Charge Exchange Emission from a Variety of Highly-ionized Ions in an Interplanetary Coronal Mass Ejection
• Simultaneous Swift X-ray and UV views of comet C/2007 N3 (Lulin)
• XMM-Newton Measurement of the Galactic Halo X-ray Emission using a Compact Shadowing Cloud
• Modeling of geocoronal solar wind charge exchange events detected with Suzaku
• Suzaku Observation of Diffuse X-Ray Emission from a Southwest Region of the Carina Nebula