Other
Scientific paper
Nov 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...225.1076b&link_type=abstract
Astrophysical Journal, Part 1, vol. 225, Nov. 1, 1978, p. 1076-1082. Research supported by the Science Research Council of Engl
Other
11
Bremsstrahlung, Solar X-Rays, Spectrum Analysis, Distribution Moments, Nonthermal Radiation, Solar Spectra, Thermal Radiation
Scientific paper
The problems of deriving temperature structure for thermal hard X-ray sources and electron spectra for nonthermal sources, from their bremsstrahlung continuum spectra, are briefly reviewed and the dangers of model-fitting are reiterated. A more satisfactory approach is developed in terms of the evaluation of integral moments of the distribution function. Using thermal analysis of the impulsive solar hard X-ray burst of 1970 March 1 as an illustration, the integral moment method is shown to give a rapid assessment of the real information content of a bremsstrahlung spectrum. In particular it is shown that due to limitations of bandwidth and, to a lesser extent, of spectral resolution, current hard X-ray spectrometry alone is incapable of distinguishing isothermal, multithermal, and nonthermal sources. Criteria are established for the spectrometer needed to define a thermal source distribution to within some specified accuracy.
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