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Evidence for the Formation of a Large-Scale Current Sheet in a Solar Flare View all abstracts by submitter

Linhui Sui   Submitted: 2003-09-09 12:23

We present X-ray evidence for the formation of a large-scale current sheet in a flare observed by the Ramaty High Energy Solar Spectroscopic Imager on 2002 April 15. The flare occurred on the northwest limb, showing a cusp-shaped flare loop in the rise phase. When the impulsive rise in hard X-rays (>25 keV) began, the cusp part of the coronal source separated from the underlying flare loop and remained stationary for about 2 minutes. During this time the underlying flare loops shrank at ~9 km s-1. The temperature of the underlying loops increased towards higher altitudes, while the temperature of the coronal source increased towards lower altitudes. These results indicate that a current sheet formed between the top of the flare loops and the coronal source during the early impulsive phase. After the hard X-ray peak, the flare loops grew outward at ~8 km s-1, and the coronal source moved outward at ~300 km s-1, indicating an upward expansion of the current sheet. About 30 minutes later, post-flare loops seen in the SOHO Extreme Ultraviolet Imaging Telescope 195 A passband rose at ~10 km s-1. A large coronal loop-like structure, observed by the SOHO Large Angle and Spectrometric Coronagraph C2 and C3 detectors, also propagated outward at ~300 km s-1. These observations are all consistent with the continued expansion of the current sheet.

Authors: Sui, L, Holman, G. D.
Projects: RHESSI

Publication Status: ApJ Letter (in press, issue of Oct. 20)
Last Modified: 2003-09-09 12:25
Go to main E-Print page  Type II radio precursor and X-ray flare emission  Hard X-ray and metric/decimetric spatially resolved observations of the 10 April 2002 solar flare  Edit Entry  Download Preprint  Delete Entry 

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