Mass and energy of erupting plasma associated with coronal mass ejections in X-rays and EUV

Abstract:

We investigate the mass and energy of erupting plasma observed in X-ray and EUV, which are associated with both coronal mass ejections (CMEs) and X-ray flares. Hinode/XRT observed the erupting hot plasma in a few passbands, which allows us to determine the temperature of the plasma using a filter ratio method. SDO/AIA observed the erupting plasma in EUV passbands. We estimate the temperatures and emission measures of the erupting plasma in EUV using a differential emission measure method. One of these observations shows eruptive plasma with a loop-like structure in X-ray and EUV. The temperature of the erupting plasma in X-ray is about 13 MK by the filter ratio method. The estimated mass of this erupting plasma in X-ray is similar to that in EUV. In addition, we estimate the radiative loss, thermal conduction, thermal, and kinetic energies of the eruptive hot plasma in X-rays. We find that the thermal conduction time scale is much shorter than the duration of eruption. This result implies that additional heating during the eruption may be required to explain the hot plasma observations in X-rays. A couple of events are associated with the eruptions of prominences as absorption features in EUV in addition to hot plasma eruption. One event shows that the absorption features change to emission features at the beginning of their eruptions in all EUV wavelengths of SDO/AIA. By estimating the energy budget of the erupting plasmas, we discuss the heating of the plasmas associated with coronal mass ejections in the low corona.