Hard X-ray bremsstrahlung emission and polarization in a flaring loop affected by electron beams

Details Hard X-ray bremsstrahlung emission and polarization in a flaring loop affected by electron beams Hard X-ray bremsstrahlung emission and polarization in a flaring loop affected by electron beams

Mar 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996adspr..17...81z&link_type=abstract

Advances in Space Research (ISSN 0273-1177), vol. 17, no. 4-5, p. (4/5)81-(4/5)86

Astronomy and Astrophysics

Astronomy

Bremsstrahlung, Electron Beams, Solar Corona, Solar Flares, X Ray Astronomy, Anisotropy, Distribution Functions, Emission Spectra, Energy Dissipation, Energy Distribution, Time Dependence

Scientific paper

Using a kinetic approach the hard X-ray bremsstrahlung emission and polarization produced by an electron beam injected, with a power law energy distribution from the corona into the chromosphere are investigated. The time-dependent kinetic equation was solved numerically in a flaring loop taking into account the energy losses and anisotropy of electron scattering for the following channels: Coulomb collisions and inelastic ones with neutral atoms, Ohmic dissipation and adiabatic scattering in a converging and inelastic ones with neutral atoms, Ohmic dissipation and adiabatic scattering in a converging magnetic field. The temporal hard X-ray bremsstrahlung emission profiles are symmetic ones which resemble the observations for events with the timescale aroung a few seconds. The intensity of the X-ray bremsstrahlung emission increases and its directivity decreases with the time of a beam injection. The polarization is found to vary noticeably with the emergent photon energies below 40 keV being up to 30% and down to - 10% for different angles of view. Harder X-ray polarization is almost constant with increase of photon energy, within a fixed angle of view.

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