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- W2896142785 abstract "Observations of solar flares at sub-THz frequencies (millimetre and sub-millimetre wavelengths) over the last two decades often show a spectral component rising with frequency. Unlike a typical gyrosynchrotron spectrum decreasing with frequency or a weak thermal component from hot coronal plasma, the observations can demonstrate a high flux level (up to ∼10 4 solar flux units at 0.4 THz) and fast variability on sub-second timescales. Although, many models have been put forward to explain the puzzling observations, none of them has clear observational support. Here we propose a scenario to explain the intriguing sub-THz observations. We show that the model, based on free-free emission from the plasma of flare ribbons at temperatures 10 4 − 10 6 K, is consistent with all existing observations of frequency-rising sub-THz flare emission. The model provides a temperature diagnostic of the flaring chromosphere and suggests fast heating and cooling of the dense transition region plasma." @default.
- W2896142785 created "2018-10-26" @default.
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- W2896142785 date "2018-12-01" @default.
- W2896142785 modified "2023-10-15" @default.
- W2896142785 title "Frequency rising sub-THz emission from solar flare ribbons" @default.
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- W2896142785 doi "https://doi.org/10.1051/0004-6361/201834124" @default.
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