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Your search keyword '"Morgachev, A. S."' showing total 22 results
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22 results on '"Morgachev, A. S."'

21. On the Source of Sub-Terahertz Radiation of the Solar Flare on April 2, 2017.

Author

Morgachev, A. S., Tsap, Yu. T., Smirnova, V. V., and Motorina, G. G.

Subjects
*SOLAR radiation, *RADIATION sources, *SOLAR flares, *PLASMA temperature, *ATMOSPHERIC models, *HEAT flux, *SOLAR chromosphere
Abstract

The study analyzes the millimeter emission of a solar flare on April 2, 2017, observed by the Bauman Moscow State Technical University telescope RT-7.5. Based on the flare atmosphere model proposed by Machado et al. (1980) we inferred the emission contribution function of the source and determined its main characteristics. The results show that the subterahertz emission is formed in a thin, chromospheric layer with a thickness of about 10 km with a plasma temperature of ~105 K. The proposed homogeneous model of the layer makes it possible to explain the observed spectral features. The obtained results suggest the chromospheric source heating with heat fluxes generated in the overlying flare areas. [ABSTRACT FROM AUTHOR]

Published
2019
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22. On the origin of 140GHz emission from the 4 July 2012 solar flare

Author

Tsap, Yuriy T., Smirnova, Victoria V., Morgachev, Alexander S., Motorina, Galina G., Kontar, Eduard P., Nagnibeda, Valery G., and Strekalova, Polina V.

Subjects
Astrophysics::High Energy Astrophysical Phenomena, Physics::Space Physics, Astrophysics::Solar and Stellar Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, Astrophysics::Galaxy Astrophysics
Abstract

The sub-THz event observed on the 4 July 2012 with the Bauman Moscow State Technical University Radio Telescope RT-7.5 at 93 and 140 GHz as well as Kislovodsk and Metsähovi radio telescopes, Radio Solar Telescope Network (RSTN), GOES, RHESSI, and SDO orbital stations is analyzed. The spectral flux between 93 and 140 GHz has been observed increasing with frequency. On the basis of the SDO/AIA data the differential emission measure has been calculated. It is shown that the thermal coronal plasma with the temperature above 0.5 MK cannot be responsible for the observed sub-THz flare emission. The non-thermal gyrosynchrotron mechanism can be responsible for the microwave emission near 10 GHz but the observed millimeter spectral characteristics are likely to be produced by the thermal bremsstrahlung emission from plasma with a temperature of about 0.1 MK.

Published
2016

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