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X-ray emission generated through solar-wind charge exchange (SWCX) is knownto contaminate X-ray observation data, the amount of which is often significantor even dominant, particularly in the soft X-ray band, when the main target iscomparatively weak diffuse sources, depending on the space weather during theobservation. In particular, SWCX events caused by interplanetary coronal massejections (ICMEs) tend to be spectrally rich and to provide criticalinformation about the metal abundance in the ICME plasma. We analyzed theSN1006 background data observed with Suzaku on 2005 September 11 shortly afteran X6-class solar flare, signatures of which were separately detected togetherwith an associated ICME. We found that the data include emission lines from avariety of highly ionized ions generated through SWCX. The relative abundancesof the detected ions were found to be consistent with those in past ICME-drivenSWCX events. Thus, we conclude that this event was ICME-driven. In addition, wedetected a sulfur XVI line for the first time as one from the SWCX emission,the fact of which suggests that it is the most spectrally-rich SWCX event everobserved. We suggest that observations of ICME-driven SWCX events can provide aunique probe to study the population of highly-ionized ions in the plasma,which is difficult to measure in currently-available in-situ observations.

Suzaku Detection of Solar Wind Charge Exchange Emission from a Variety of Highly-ionized Ions in an Interplanetary Coronal Mass Ejection