A LONG-DURATION SOLAR-FLARE WITH MASS EJECTION AND GLOBAL CONSEQUENCES

We report observations of a long-duration flare with mass ejection fro m the corona, using the Yohkoh soft X-ray telescope (SXT). This flare occurred 1994 November 13 near disk center during quiet solar conditio ns, with excellent temporal coverage of both the core activity in the active region itself and of the global corona. The initial X-ray image s reveal two arcades of cusped magnetic loops, connected via a series of thin loops. These loops rise rapidly during the increasing phase of soft X-ray flare brightness. In its final state, the flare has the co nfiguration of postflare loops with a cusp. Large regions of the X-ray corona appear to empty during the evolution of the event. We suggest that this corresponds a coronal mass ejection (CME) seen in soft X-ray s. Its detection in the SXT images is consistent with the finding that material participating in a CME exists at elevated coronal temperatur es (2.8 x 10(6) K in this case) before the ejection. We estimate a mas s >4 x 10(14) g for the ejected material. The X-ray morphology of the event has strong points of similarity with the classical reconnection picture of long-duration event (LDE) formation, but there are signific ant discrepancies: there is no observed inward flow during the rise ph ase, the expansions are multiple and appear to be nonradial, and none of the observed motions suggest a reconnection jet. We note the subseq uent occurrence of very large scale coronal disturbances, including re gions near the boundaries of coronal holes at both poles. We suggest t hat this global disturbance implies a perturbation reaching as far out ward as the heliospheric neutral sheet. The exciter would require a ho rizontal velocity of approximately 200 km s(-1) in such a case, consis tent with the projected velocity of the plasma cloud that we identify with a CME in the process of launching.