Numerical Simulation of Sub-Terahertz Thermal Emission: RADYN Code

0539776 - ASÚ 2022 RIV RU eng J - Journal Article
Morgachev, A. S. - Tsap, Yu. T. - Smirnova, V.V. - Motorina, Galina - Bárta, Miroslav
Numerical Simulation of Sub-Terahertz Thermal Emission: RADYN Code.
Geomagnetism and Aeronomy. Roč. 60, č. 8 (2020), s. 1038-1049. ISSN 0016-7932. E-ISSN 1555-645X
R&D Projects: GA MŠMT(CZ) LM2015067
Institutional support: RVO:67985815
Keywords : numerical simulation * flare chromosphere * transition region
OECD category: Astronomy (including astrophysics,space science)
Impact factor: 0.701, year: 2020
Method of publishing: Limited access
https://doi.org/10.1134/S0016793220080174

The temporal evolution of thermal bremsstrahlung in the sub-terahertz range is calculated for F-CHROMA models of the flare chromosphere and transition region (https://www.fchroma.org). These models are calculated based on the numerical solution of the system of equations of radiation hydrodynamics with the RADYN code, which describes the response of chromospheric plasma to the flux of accelerated electrons in the form of a triangular pulse. It is found that the positive slope of the spectrum in the frequency range of 93-400 GHz is formed during the entire burst. The sub-THz radiation peak can be both ahead and behind the maximum of the function of the injection of energetic electrons depending on the number and index of the spectrum of precipitating particles. In some cases, the time profile of the sub-THz radiation is quite complex and pulsating due to gas-dynamic phenomena in the chromosphere and transition region.
Permanent Link: http://hdl.handle.net/11104/0317476