Abstract
In the past several years, X-ray observations of the Sun made from rockets and satellites have demonstrated the existence of high temperature (∼20 × 106 – ∼100 × 106 K), low density plasmas associated with solar flare phenomena. In the hard X-ray range (λ < 1 A), spectra of the flaring plasma have been obtained using proportional and scintillation counter detectors. It is possible from these data to determine the evolution of the hard X-ray flare spectrum as the burst progresses; and by assuming either a non-thermal or thermal (Maxwellian) electron distribution function, characteristic plasma parameters such as emission measure and temperature (for a thermal interpretation) can be determined. Thermal interpretations of hard X-ray data require temperatures of ∼ 100 × 106 K.
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