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Aims: We investigate the electron acceleration in convective electric fieldsof cascading magnetic reconnection in a flaring solar corona and show theresulting hard X-ray (HXR) radiation spectra caused by Bremsstrahlung for thecoronal source. Methods: We perform test particle calculation of electronmotions in the framework of a guiding center approximation. The electromagneticfields and their derivatives along electron trajectories are obtained bylinearly interpolating the results of high-resolution adaptive mesh refinement(AMR) MHD simulations of cascading magnetic reconnection. Hard X-ray (HXR)spectra are calculated using an optically thin Bremsstrahlung model. Results:Magnetic gradients and curvatures in cascading reconnection current sheetaccelerate electrons: trapped in magnetic islands, precipitating to thechromosphere and ejected into the interplanetary space. The final location ofan electron is determined by its initial position, pitch angle and velocity.These initial conditions also influence electron acceleration efficiency. Mostof electrons have enhanced perpendicular energy. Trapped electrons areconsidered to cause the observed bright spots along coronal mass ejectionCME-trailing current sheets as well as the flare loop-top HXR emissions.

Electron acceleration by cascading reconnection in the solar corona I Magnetic gradient and curvature effects