Regular variations of 3 GHz radio flux and current-loop coalescence model of solar flares.
Abstract
The 3 GHz radio flux records of two solar flares (April 7, 1997 and March 29, 2001) with regular variations are presented. While the 3 GHz flux record of the April 7, 1997 flare shows double-peaks periodicity, the 3 GHz record of the March 29, 2001 flare reveals regular radio flux steps at the ascending part of the radio burst. We interpret the observed phenomena using the current loop coalescence model of solar flares. In the case of the April 7, 1997 event we suggest that the main period of the 3 GHz radio flux (about 100 s) corresponds to the repetition of the current loop coalescence and the radio double peaks are associated with the maxima of the electric field component perpendicular to the interaction plane. In this case the plasma β parameter in the current loop coalescence process is estimated to be 0.63. An increase of the β parameter during the flare is recognized. On the other hand, the steps-like form of the 3 GHz flux record of the March 29, 2001 event expresses an increasing amount of accelerated electrons during periodic coalescence accelerations.
- Publication:
-
Solar Variability as an Input to the Earth's Environment
- Pub Date:
- September 2003
- Bibcode:
- 2003ESASP.535..499K
- Keywords:
-
- Radio Flux;
- Solar Flares;
- Magnetic Field