1. Numerical Simulation of Sub-Terahertz Emission of the Flare Chromosphere: the Event of July 4, 2012.
- Author
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Morgachev, A. S., Tsap, Yu. T., Motorina, G. G., Smirnova, V. V., and Motorin, A. S.
- Subjects
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SOLAR flares , *LOW temperature plasmas , *HIGH temperature plasmas , *THERMAL plasmas , *PLASMA density , *RADIO telescopes - Abstract
The temporal evolution of thermal bremsstrahlung sub-THz emission from a flare chromosphere and transition region is analyzed based on the F-CHROMA solar flare model database (https://www.fchroma.org) and solar flare observations with the RT-7.5 radio telescope at 93 and 140 GHz on July 4, 2012. The model is based on the RADYN numerical code, which describes the response of chromospheric background plasma to the action of a beam of accelerated electrons in the form of a triangular pulse. The positive slope of the spectrum in the sub-THz frequency range has been formed over the entire burst. A thin layer of low temperature and high plasma density (the so-called chromospheric condensation) appears. It moves to the region of higher altitudes and effectively absorbs the sub-THz emission. It is shown based on the RНESSI hard X-ray observations that the chromospheric thermal plasma cannot provide the observed sub-THz emission fluxes during the solar flare on July 4, 2012. The cause of the obtained discrepancy is discussed. [ABSTRACT FROM AUTHOR]
- Published
- 2021
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