Observations of the December 6, 2006 solar flare: Electron acceleration and plasma heating |
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Authors: | A B Struminsky I V Zimovetz |
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Institution: | 1.Space Research Institute,Russian Academy of Sciences,Moscow,Russia |
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Abstract: | The flare plasma temperature calculated from GOES-11 (1.5–12.4 and 3.1–24.8 keV) data is compared with the solar nonthermal
fluxes in various energy ranges in the December 6, 2006 event. Particle acceleration and plasma heating episodes took place
in the pre-flare and impulsive phases; a hard (ACS SPI > 150 keV) X-ray emission was observed 5 min before the onset of the GOES X-ray flare and was not accompanied by a temperature
rise. A close correlation has been found between the flare plasma temperature and the hard X-ray intensity. The temperature
delayed by 0.4 min turned out to be directly proportional to the logarithm of the ACS SPI count rate within the first 3 min
of the impulsive phase. This shows that the accelerated electrons responsible for the X-ray emission were the main plasma
heating source in the pre-flare and impulsive phases. The correlation between the temperature and the hard X-ray intensity
disappears after the observation of a resonance peak at a frequency of 245 MHz. Significant electron fluxes may no longer
be able to effectively heat the expanding plasma when its density in the interaction region reaches ∼109 cm−3. The observations of the July 23, 2002 and December 5, 2006 events confirm the trends found. |
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