X-Ray Plasma Ejection Associated with an Impulsive Flare on 1992 October 5: Physical Conditions of X-Ray Plasma Ejection

Details X-Ray Plasma Ejection Associated with an Impulsive Flare on 1992 October 5: Physical Conditions of X-Ray Plasma Ejection X-Ray Plasma Ejection Associated with an Impulsive Flare on 1992 October 5: Physical Conditions of X-Ray Plasma Ejection

May 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998apj...499..934o&link_type=abstract

Astrophysical Journal v.499, p.934

Astronomy and Astrophysics

Astronomy

112

Sun: Activity, Sun: Corona, Sun: Flares, Sun: X-Rays, Gamma Rays

Scientific paper

The 1992 October 5 flare was associated with an X-ray plasma ejection. Although the ejected plasma looks like a blob (or plasmoid) in short-exposure images, in long-exposure images it appears to be penetrated by or connected to the top of a large-scale loop. The ejecta had started to rise with a speed of ~250 km s-1 before the main peak of the hard X-ray emission and was accelerated during the impulsive phase (to ~500 km s-1). We derived the physical parameters of the ejected plasma and obtained the following results: (1) The temperature of the ejected plasma was 10.6 +/- 3.6 MK. (2) Its density was (8-16) x 109 cm-3 and was an order of magnitude larger than that of the typical active-region corona. (3) The mass of the ejected plasma was (2-4) x 1013 g. (4) The kinetic energy of the ejecta was smaller than the thermal energy content of the flare loop. The overall features and evolution of the hot plasma ejection and flare are in rough agreement with those expected from the reconnection model, and the reconnection rate (MA = Vin/VA) is estimated to be ~0.02, where Vin is the speed of the inflow into the reconnection region, and VA is the Alfven speed. Result 4, however, is not consistent with the assumption in some reconnection models that an ejected plasma stretches the overlying magnetic fields to form a current sheet and hence leads to magnetic reconnection. Instead, our results suggest that both X-ray plasma ejection and reconnection are a consequence of a common dynamical process such as the global MHD instability.

Affiliated with

Also associated with

No associations

Rating

X-Ray Plasma Ejection Associated with an Impulsive Flare on 1992 October 5: Physical Conditions of X-Ray Plasma Ejection 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 X-Ray Plasma Ejection Associated with an Impulsive Flare on 1992 October 5: Physical Conditions of X-Ray Plasma Ejection, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and X-Ray Plasma Ejection Associated with an Impulsive Flare on 1992 October 5: Physical Conditions of X-Ray Plasma Ejection will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1367912