Center-to-limb variations of characteristics of solar flare hard X-ray and gamma-ray emission

Details Center-to-limb variations of characteristics of solar flare hard X-ray and gamma-ray emission Center-to-limb variations of characteristics of solar flare hard X-ray and gamma-ray emission

Sep 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...379..381m&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 379, Sept. 20, 1991, p. 381-391.

Astronomy and Astrophysics

Astrophysics

28

Gamma Ray Bursts, Solar Electrons, Solar Flares, Solar Limb, Solar X-Rays, Electron Acceleration, Electron Distribution, Flux Density, Power Spectra

Scientific paper

An analysis is presented of the observed distribution of fluxes and spectral indices of flares at X-ray and gamma-ray range, with particular emphasis on the variation with heliocentric longitude of these distributions and their moments. It is shown how these distributions can be used to set constraints on the distribution and average values of model parameters describing the characteristics of the accelerated electrons and flare plasma. A comparison of X-ray and gamma-ray spectral indices show that the spectrum of the accelerated electrons must flatten at higher energies. The Gaussian width of the pitch angle distribution of electrons beamed along the field lines and the convergence rate of the magnetic field are delimited. It is concluded that isotropic pitch angle distributions or distributions peaking perpendicular to the field lines, and field convergence rate with more than a fivefold increase in the magnetic field from corona to the photosphere can be ruled out.

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