High-Frequency Fiber Bursts Observed during The July 11, 2005 Flare
Abstract
A unique quasi-periodic activity of the 1-2 GHz fiber bursts observed during the July 11, 2005, B4.0 flare is presented. Groups of fibers and individual fibers occur with the period of about of 65 s and 1 s, respectively. The frequency drift of the fibers was found in the interval -40 - -160 MHz s^{-1}. Unique cases of a sudden start and sudden end of a group of fibers are shown. Considering the whistler or Alfvén wave velocities for the interpretation of the frequency drift of fibers and the Aschwanden's density model (2002) the magnetic field in the fiber radio source was estimated as 8-9 G or 25-60 G, respectively.
- Publication:
-
Central European Astrophysical Bulletin
- Pub Date:
- 2007
- Bibcode:
- 2007CEAB...31..181K
- Keywords:
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- Sun;
- plasmas;
- flares;
- radio radiation