Suzaku Detection of Solar Wind Charge Exchange Emission from a Variety of Highly-ionized Ions in an Interplanetary Coronal Mass Ejection
arXiv:2102.11298 · doi:10.1093/pasj/psab015
Abstract
X-ray emission generated through solar-wind charge exchange (SWCX) is known to contaminate X-ray observation data, the amount of which is often significant or even dominant, particularly in the soft X-ray band, when the main target is comparatively weak diffuse sources, depending on the space weather during the observation. In particular, SWCX events caused by interplanetary coronal mass ejections (ICMEs) tend to be spectrally rich and to provide critical information about the metal abundance in the ICME plasma. We analyzed the SN1006 background data observed with Suzaku on 2005 September 11 shortly after an X6-class solar flare, signatures of which were separately detected together with an associated ICME. We found that the data include emission lines from a variety of highly ionized ions generated through SWCX. The relative abundances of the detected ions were found to be consistent with those in past ICME-driven SWCX events. Thus, we conclude that this event was ICME-driven. In addition, we detected 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 ever observed. We suggest that observations of ICME-driven SWCX events can provide a unique probe to study the population of highly-ionized ions in the plasma, which is difficult to measure in currently-available in-situ observations.
arXiv comment26 pages, 11 figures, 6 tables, accepted for publication in PASJ
References in corpus (17)
- Hard X-ray Detector (HXD) on Board Suzaku
- Monte-Carlo Simulator and Ancillary Response Generator of Suzaku XRT/XIS System for Spatially Extended Source Analysis
- The 2-8 keV cosmic X-ray background spectrum as observed with XMM-Newton
- Reproducibility of Non-X-ray Background for the X-ray Imaging Spectrometer aboard Suzaku
- XMM-Newton Observation of Solar Wind Charge Exchange Emission
- Study of the X-Ray Background Spectrum and its Large-Scale Fluctuation with ASCA
- Chandra Observations of the "Dark" Moon and Geocoronal Solar-Wind Charge Transfer
- First Determination of the True Mass of Coronal Mass Ejections: A Novel Approach to Using the Two STEREO Viewpoints
- Spectral Analysis of the Chandra Comet Survey
- A high charge state Coronal Mass Ejection seen through solar wind charge exchange emission as detected by XMM-Newton
- Identifying XMM-Newton observations affected by solar wind charge exchange - Part I
- Resolving the Origin of the Diffuse Soft X-ray Background
- Solar Wind Charge Exchange: An Astrophysical Nuisance
- Identifying XMM-Newton observations affected by solar wind charge exchange - Part II
- Inverse FIP Effects in Giant Solar Flares Found from Earth X-Ray Albedo with Suzaku/XIS
- Enhancement of Terrestrial Diffuse X-ray Emission Associated With Coronal Mass Ejection and Geomagnetic Storm
- Suzaku detection of enigmatic geocoronal solar wind charge exchange event associated with coronal mass ejection