A Long-Duration Solar Flare with Mass Ejection and Global Consequences

Details A Long-Duration Solar Flare with Mass Ejection and Global Consequences A Long-Duration Solar Flare with Mass Ejection and Global Consequences

Oct 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996apj...470..629h&link_type=abstract

Astrophysical Journal v.470, p.629

Astronomy and Astrophysics

Astronomy

98

Sun: Flares, Sun: Corona, Sun: Magnetic Fields, Sun: Particle Emission

Scientific paper

We report observations of a long-duration flare with mass ejection from the corona, using the Yohkoh soft X-ray telescope (SXT). This flare occurred 1994 November 13 near disk center during quiet solar conditions, with excellent temporal coverage of both the core activity in the active region itself and of the global corona. The initial X-ray images 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 configuration 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-rays. Its detection in the SXT images is consistent with the finding that material participating in a CME exists at elevated coronal temperatures (2.8 x 106 K in this case) before the ejection. We estimate a mass >4 x 1014 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 significant discrepancies: there is no observed inward flow during the rise phase, the expansions are multiple and appear to be nonradial, and none of the observed motions suggest a reconnection jet. We note the subsequent occurrence of very large scale coronal disturbances, including regions near the boundaries of coronal holes at both poles. We suggest that this global disturbance implies a perturbation reaching as far outward as the heliospheric neutral sheet. The exciter would require a horizontal velocity of approximately 200 km s-1 in such a case, consistent with the projected velocity of the plasma cloud that we identify with a CME in the process of launching.

Affiliated with

Also associated with

No associations

Rating

A Long-Duration Solar Flare with Mass Ejection and Global Consequences does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with A Long-Duration Solar Flare with Mass Ejection and Global Consequences, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and A Long-Duration Solar Flare with Mass Ejection and Global Consequences will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1212749