Dynamics of energetic electrons in a solar flare loop and the flattening of its millimeter-wavelength radio emission spectrum

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Scientific paper

A comparison of predictions by the dynamical trap- plus- precipitation model of broadband microwave bursts and the empirical data on intensive solar flares at centimeter and millimeter wavelengths is presented. The main finding of the data analysis and model calculations is the spectral flattening throughout the entire burst duration. This effect occurs always in the decay phase of the flux peaks at frequencies well above the spectrum peak frequency and is independent of the burst duration. It was found that in some bursts the flux maxima at the higher frequencies are delayed compared to the maxima at the lower frequencies. These effects can be interpreted as being a consequence of the hardening of the electron energy spectrum in the decay phase of the burst.

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