Time-dependent Hinode/EIS Atlas of a Coronal Mass Ejection Containing Cool Material

Abstract

Abstract We report the first time-dependent spectral atlas of a coronal mass ejection (CME) observed by the Hinode/Extreme Ultraviolet Imaging Spectrometer (EIS). EIS observed the Cartwheel CME on 2008 April 9 at 09:30–10:00 UT in its full wavelength range and captured the bright core containing prominence material as it passed across the slit field of view. The measurement of the differential emission measure (DEM) showed that the observation captured two plasma components, a coronal component at Log T ≈ 6.05 K and a cold component at Log T ≈ 5.30 K, which we interpret as the prominence material in the CME core. We used this DEM to develop a spectral atlas for the four EIS spectra containing the CME material and the pre- and postevent spectra. These observations provide the basis for studying CME plasma evolution in the low solar corona, as well as guide observations from the current and upcoming spectrometers, including Solar Orbiter/SPICE, Solar-C/EUVST, and MUSE, which will advance our understanding of CME plasma evolution.