Pre-impulsive flare energy release according to sub-terahertz and X-ray solar observations
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Abstract
We study time delays between X-ray and sub-terahertz emission at the initial phase of solar flares to clarify the nature of heating of the transition region and upper chromosphere of the Sun. Analysis of a series of events showed that hard X-ray emission is delayed relative to sub-THz emission at the onset of flares by 3–6 minutes for some considered events. The electron thermal conductivity of the coronal plasma cannot ensure the effective heating of the transition region and solar chromosphere. This suggests the heating of the chromospheric plasma in situ during the pre-impulsive phase of solar flares.
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