Electron acceleration in a post-flare decimetric continuum source (Research Note)

Prasad Subramanian

doi:10.1051/0004-6361:20077341

Electron acceleration in a post-flare decimetric continuum source (Research Note)

2007-04-24

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DOI：10.1051/0004-6361:20077341

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Aims. To calculate the power budget for electron acceleration and the efficiency of the plasma emission mechanism in a post-flare decimetric continuum source. Methods. We have imaged a high brightness temperature (similar to 10(9) K) post-flare source at 1060 MHz with the Giant Metrewave Radio Telescope (GMRT). We use information from these images and the dynamic spectrum from the Hiraiso spectrograph together with the theoretical method described in Subramanian & Becker (2006, Sol. Phys., 237, 185) to calculate the power input to the electron acceleration process. The method assumes that the electrons are accelerated via a second-order Fermi acceleration mechanism. Results. We find that the power input to the nonthermal electrons is in the range 3 x 10(25)-10(26) erg/s. The efficiency of the overall plasma emission process starting from electron acceleration and culminating in the observed emission could range from 2.87 x 10(-9) to 2.38 x 10(-8).

Keywords:

acceleration of particles

plasmas

Sun : radio radiation

Sun : corona

Sun : flares

Electron acceleration in a post-flare decimetric continuum source (Research Note)

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