X-Ray Emission due to Charge Exchange between Solar Wind and Earth Atmosphere on September 12, 2005

The Suzaku satellite observed a region close to the supernova remnant SN1006 twice on September 12, 2005, and on January 26, 2006. During the first observation the region was bright in a soft X-ray band. Comparing the CCD spectra of the two observations, we found that the soft X-ray brightening can be explained by emission lines from ionized carbon, nitrogen, oxygen, iron, and so on. Emission lines due to the transitions from the M shell or higher to the K shell were included. These characteristics strongly suggest that the origin of the soft X-ray brightening is the charge exchange between solar wind ions and neutral atoms in the Earth atmosphere.