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We present the study of SOL2015-03-15 M1.2 flare, revealing acceleration ofelectrons and plasma heating in the sheared twisted magnetic structure in thepolarity inversion line (PIL). The scope is to make the analysis of nonthermalelectrons dynamics and plasma heating in the highly stressed magnetic loopsinteracting in the PIL by using X-ray, microwave, ultraviolet, and opticalobservations. It is found that the most probable scenario for the energyrelease in the PIL is the tether-cutting magnetic reconnection between thelow-lying (3 Mm above the photosphere) magnetic loops within a twisted magneticflux rope. Energetic electrons with the hardest spectrum were appeared at theonset of plasma heating up to the super-hot temperature of 40 MK. Theseelectrons are localized in a thin magnetic channel with width of around 0.5 Mmwith high average magnetic field of about 1200 G. The plasma beta in thesuper-hot region is less than 0.01. The estimated density of acceleratedelectrons is about 10^9 cm^-3 that is much less than the super-hot plasmadensity. The energy density flux of non-thermal electrons is estimated up to3x10^12 ergs cm^-2s^-1 that is much higher than in the currently availableradiative hydrodynamic models. These results revealed that one need to developnew self-consisting flare models reproducing 3D magnetic reconnection in thePIL with strong magnetic field, spatial filamentation of energy release,formation of high energy density populations of nonthermal electrons andappearance of the super-hot plasma.

astrophysical journal/the astrophysical journal

Flare Energy Release in the Magnetic Field Polarity Inversion Line  During M1.2 Solar Flare of March 15, 2015. Paper I. Onset of Plasma Heating  and Electrons Acceleration