Soft X-Ray Signatures of Coronal Ejections

We have a new view of the time behavior of the inner solar corona via the extensive soft X-ray observations of Yohkoh. These show many forms of expansion of coronal material, ranging from highly collimated structures (jets) to large-scale evacuations ("dimmings") of the diffuse corona. We review these effects, emphasizing those probably related to CMEs, and present a preliminary classification scheme of the large-scale ejections seen in soft X-rays. The new observations bring clarity and focus to the well-established scenario of filament channel -+ CME -+ X-ray arcade. The associated Xray brightening typically occurs in a close temporal relationship with the ejection as inferred from the dimming, but the location of the ejected mass may be displaced from the region of strongest brightening. The soft X-ray observations thus far have shown no clear example of the familiar three-part structure of CMEs as seen in white-light coronal images.