Astronomy and Astrophysics – Astronomy
Scientific paper
May 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976rspta.281..473b&link_type=abstract
(Royal Society, Discussion on the Physics of the Solar Atmosphere, London, England, Jan. 14, 15, 1975.) Royal Society (London),
Astronomy and Astrophysics
Astronomy
18
Radiant Flux Density, Solar Flares, Solar X-Rays, X Ray Density Measurement, Astronomical Models, Bremsstrahlung, Compton Effect, Electron Accelerators, Solar Radio Bursts, Synchrotron Radiation, X Ray Astronomy
Scientific paper
Interpretations of hard X-ray bursts are reviewed by examining the requirements imposed by observational data on flare energy release. Several pure bremsstrahlung models for the emission mechanism are discussed, characteristic time profiles are analyzed, and observational evidence for the rival bremsstrahlung models is presented. The problem of electron acceleration in such models is considered in terms of total energy released, the number of electrons involved, characteristic time scales, and acceleration spectra. Noting that a normal bremsstrahlung interpretation places severe demands on acceleration mechanisms, some solutions to this problem are suggested, including 'recycling' of electrons, synchrotron and inverse Compton processes, and the thermal contribution at high energies. Observations of soft X-ray flares are briefly reviewed, and it is argued that nonisothermal models are essential in this context.
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