Hard X-ray bremsstrahlung production in solar flares by high-energy proton beams

Details Hard X-ray bremsstrahlung production in solar flares by high-energy proton beams Hard X-ray bremsstrahlung production in solar flares by high-energy proton beams

Aug 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...295..648e&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 295, Aug. 15, 1985, p. 648-653. SERC-supported research.

Astronomy and Astrophysics

Astrophysics

28

Bremsstrahlung, Electron Beams, Gamma Ray Bursts, Proton Beams, Solar Flares, Solar X-Rays, Integral Equations, Plasma Density

Scientific paper

The possibility that solar hard X-ray bremsstrahlung is produced by acceleration of stationary electrons by fast-moving protons, rather than vice versa, as commonly assumed, was investigated. It was found that a beam of protons which involves 1836 times fewer particles, each having an energy 1836 times greater than that of the electrons in the equivalent electron beam model, has exactly the same bremsstrahlung yield for a given target, i.e., the mechanism has an energetic efficiency equal to that of conventional bremsstrahlung models. Allowance for the different degrees of target ionization appropriate to the two models (for conventional flare geometries) makes the proton beam model more efficient than the electron beam model, by a factor of order three. The model places less stringent constraints than a conventional electron beam model on the flare energy release mechanism. It is also consistent with observed X-ray burst spectra, intensities, and directivities. The altitude distribution of hard X-rays predicted by the model agrees with observations only if nonvertical injection of the protons is assumed. The model is inconsistent with gamma-ray data in terms of conventional modeling.

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