Modeling Radiation from the Solar Atmosphere in the sub-mm, mm and cm Wavelength Range

Kuhar, Matej (2014) Modeling Radiation from the Solar Atmosphere in the sub-mm, mm and cm Wavelength Range. Diploma thesis, Faculty of Science > Department of Physics.

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Abstract

Maps of the Sun in millimeter wavelength range reveal emission features (high temperature regions, HTR) and apsorptive features (low temperature regions, LTR). Thermal bremsstrahlung and gyromagnetic (cyclotron) radiation mechanism can be important for explaining the observed phenomena. We use a procedure for calculating the brightness temperature for a given wavelength and model atmosphere, which integrates the radiative transfer equation for thermal bremsstrahlung. Until now, it has been used just for the radiation with wavelength of 8 mm. The aim of the present work is to apply the models for different structures of the solar atmosphere on a broader wavelength range (from 0.3 mm to 1 cm), closely related to that of Atacama Large Millimeter/submillimeter Array (ALMA), and to compare the results with observations. We conclude that thermal bremsstrahlung is the only important radiation mechanism in the submillimeter and millimeter wavelength range, which can explain previous observations of the Sun’s intensity of radiation. In the near future, we will be able to compare the results of our models to new observations of ALMA telescope.

Item Type: Thesis (Diploma thesis)
Keywords: Solar Atmosphere
Supervisor: Brajša, Roman
Date: 12 September 2014
Number of Pages: 44
Subjects: NATURAL SCIENCES > Physics > Astronomy and Astrophysics
Divisions: Faculty of Science > Department of Physics
Depositing User: Gordana Stubičan Ladešić
Date Deposited: 26 Nov 2014 17:52
Last Modified: 19 Jan 2017 14:48
URI: http://digre.pmf.unizg.hr/id/eprint/3385

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