Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997a%26a...320l..13z&link_type=abstract
Astronomy and Astrophysics, v.320, p.L13-L16
Astronomy and Astrophysics
Astrophysics
2
Sun: Flares, Sun: X-Rays, Plasmas, Electron Beams
Scientific paper
Electron beam distribution functions, found from a joint solution of the kinetic and electric current conservation equations for an electron beam in converging magnetic field, are used for the calculations of resulting hard X-ray bremsstrahlung fluxes for beams with different parameters. X-ray fluxes are shown to have non-monotonic energy distributions with the flux depression (dip) at 20-25keV, caused by the effect of an electric current on the beam electron distributions, with spectral indices before the dip higher by 1-1.5 units than after it. These effects can explain surprisingly well the observational discrepancies in spectral indices and total energy fluxes, detected from SMM and Yohkoh hard X-ray observations in different energy bands.
Syniavskii D. V.
Zharkova Valentin
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