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We study two modifications of the collisional thick-target model (CTTM) basedon the global and local re-acceleration of non-thermal electrons by static andstochastic electric fields during their transport from the coronal accelerationsite to the thick-target region in the chromosphere. We concentrate on acomparison of the non-thermal electron distribution functions, chromosphericenergy deposits, and HXR spectra obtained for both considered modificationswith the CTTM itself. The results were obtained using a relativistictest-particle approach. We simulated the transport of non-thermal electronswith a power-law spectrum including the influence of scattering, energy losses,magnetic mirroring, and also the effects of the electric fields correspondingto both modifications of the CTTM. We show that both modifications of the CTTMchange the outcome of the chromospheric bombardment in several aspects. Themodifications lead to an increase in chromospheric energy deposit, change ofits spatial distribution, and a substantial increase in the corresponding HXRspectrum intensity.

Modifications of thick-target model: re-acceleration of electron beams by static and stochastic electric fields