On the role of reverse current on the hard X-ray production in solar flares and time-lags between high- and low-energy photons

Details On the role of reverse current on the hard X-ray production in solar flares and time-lags between high- and low-energy photons On the role of reverse current on the hard X-ray production in solar flares and time-lags between high- and low-energy photons

Sep 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992ap%26ss.195..401b&link_type=abstract

Astrophysics and Space Science (ISSN 0004-640X), vol. 195, no. 2, p. 401-412.

Astronomy and Astrophysics

Astrophysics

Electron Energy, Photon-Electron Interaction, Solar Electrons, Solar Flares, Solar X-Rays, Time Lag, Angular Distribution, Electron Density (Concentration), X Ray Sources

Scientific paper

The paper studies the evolution of energy and angular distributions of electrons accounting for the reverse current effect by combining analytically treated small angle multiple scatterings with large angle Monte Carlo calculations. Reverse current and potential variations as a function of column density have been computed. It is found that the reverse current decreases steeply with increase in electron energy. However, it becomes significant for low-energy electrons. By use of these distributions and bremsstrahlung cross-section, the X-ray energy spectrum has been calculated. The nature of the resulting X-ray spectrum integrated over all column depths is similar to the one without reverse current. The time-lag between high- and low-energy photon production has been calculated. It is found that there is a small difference between time-lags as a function of observation angles. This fact can be used to test the validity of the beamed thick target model.

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