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Multiwavelength Analysis of a Solar Flare on 2002 April 15 View all abstracts by submitter

Linhui Sui   Submitted: 2005-09-30 08:28

We carried out a multiwavelength analysis of the solar limb flare on 2002 April 15. The observations all indicate that the flare occurred in an active region with an asymmetric dipole magnetic configuration. The earlier conclusion that magnetic reconnection is occurring in a large-scale current sheet in this flare is further supported by these observations: (1) Several blob-like sources, seen in RHESSI 12-25 keV X-ray images later in the flare, appeared along a line above the flare loops. These indicate the continued presence of the current sheet and are likely to be magnetic islands in the stretched sheet produced by the tearing-mode instability. (2) A cusp-like structure is seen in NoRH 34 GHz microwave images around the time of the peak flare emission. We quantitatively demonstrate that the X-ray emitting thermal plasma seen with RHESSI had a higher temperature than the microwave emitting plasma seen with NoRH. Since the radio data preferentially see cooler thermal plasma, this result is consistent with the picture in which energy release occurs at progressively greater heights and the hard X-rays see hot new loops while the radio sees older cooling loops. The kinetic energy of the coronal mass ejection (CME) associated with this flare was found to be about one order of magnitude less than both the thermal energy in the hot plasma and the nonthermal energy carried by the accelerated electrons in the flare, as deduced from the RHESSI observations. This contrasts with the higher CME kinetic energies typically deduced for large flares.

Authors: Sui, L, Holman, G. D., White, S. M., Zhang, J.

Publication Status: ApJ, in press (Issue of Novermber 10)
Last Modified: 2005-09-30 08:28
Go to main E-Print page  Observation of Loop Connectivity Change in a Solar Flare Triggered by Loop-Loop Interaction  X-ray sources and magnetic reconnection in the X3.9 flare of 2003 November 3  Edit Entry  Download Preprint  Delete Entry 

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