Energy Transport During a Solar Flare: VLA Observations of the M1.9 Flare of 20 Aug 1992
Abstract
The GOES M1.9 flare of 20 August 1992 was observed by a large complement of instruments including the VLA, Yohkoh, and a high-speed H-alpha camera. We present a brief overview of the VLA data here. The VLA acquired maps of the evolving microwave emission at 8.4 and 15 GHz with a time resolution of 0.2 s. The main observational results are as follows: i) the microwave sources consist of two, parallel, sheared loops or loop systems; these two loop systems flared sequentially; ii) the second microwave source is clearly associated with two magnetic footpoints; iii) the microwave source shows a disturbance which propagates from the initial footpoint and over the magnetic neutral line; iv) the speed of the disturbance is roughly 3000 kms^(-1). Points along the loop show a brightening that is delayed relative to that at the primary footpoint, and the two footpoints spread apart over the course of a few minutes.
- Publication:
-
Proceedings of Kofu Symposium
- Pub Date:
- July 1994
- Bibcode:
- 1994kofu.symp..199B