My talk will be about 'The return current effect on the differential and
mean spectra of electron beams and their resulting hard X-ray emission'.
I am planning to present analytical and numerical simulations of the
distribution function, differential and mean electron spectra of
precipitating and returning electrons for the accepted hydrodynamic models a
flaring atmosphere. These will include : 1) pure collisional model as a
benchmark; 2) simple case including collisions and return current for two
options (mu=1 and mu=-1); 3) more complicated case with anisotropic
scattering.explaining the calculated maxima in energy and pitch angles in
the returning beam distributions. We also provide the explanation of a
maximum in mean electron flux distributions and consequently, a dip at lower
energies and relate it to the other model parameters. Also we propose the
semi-analytical way to include the return current effect into the inversion
problem using the energy magnitude where the observed photon spectrum have a
broken index.