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Identification of features in solar ALMA images and comparison with solar atmospheric models
Skokić, Ivica ; Brajša, R. ; Sudar, D. ; Kuhar, M. ; Benz, A. O.
Various solar features were identified in the full-disc single-dish ALMA images taken at wavelength of 1.2 and 2.8 mm and compared with H.alpha., Ca II K and EUV images and magnetograms. Assuming thermal bremsstrahlung as the dominant radiation mechanism, several models were constructed to calculate the brightness temperature of various solar features (quiet and active solar regions, filaments and coronal holes) in a wavelength range from 0.3 to 10 mm. It is found that model predictions are in a qualitative agreement with ALMA images where active regions appear brighter, while filaments and coronal holes are not discernible from the quiet Sun level. It is also found that in ALMA images regions around magnetic neutral lines appear darker than the quiet Sun. Models predict a critical frequency below which filaments should appear in absorption and above it in emission.
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ALMA Development Plan Study: Solar Research with ALMA. Final report
Brajša, R. ; Skokić, Ivica ; Bárta, Miroslav ; Bastian, T.S. ; Shimojo, M. ; White, S. M. ; Iwai, K.
The final report of the research/development project Solar Research with ALMA: Development study. The project has been demanded by ESO to the Czech node of the European ALMA Regional Center. The main goal of the project is development of the specific Solar Observing Mode for ALMA observatory. The report on demand of ESO summarizes in detail results of the WP3: Optimum strategies for project preparation, execution and post-processing. This summary of the second term of the project is precedded by a brief annoation of results described in the prevoius two mid-term reports. Main result: Based on the test (Science Verification) solar observations, which we took part in Chile in December 2014 and 2015, it has been shown that suggested procedures for solar observations with ALMA, including subsequent calibration and imaging, do work and can be used for regular ALMA science program. The report has been reviewed by international expert panel nominated by ESO.\n\n\n\n
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ALMA Development Plan Study: Solar Research with ALMA. Science cases
Brajša, R. ; Bárta, Miroslav ; Skokić, Ivica ; Wedemeyer, S. ; Bastian, T.S. ; Shimojo, M. ; White, S. M.
A mid-term progress report of the research/development project “Solar Research with ALMA: Development study”. The project has been demanded by ESO to the Czech node of the European ALMA Regional Center. The main goal of the project is development of the specific Solar Observing Mode for ALMA observatory. The report on demand of ESO summarizes results of the WP1: Solar science cases. Possible solar science cases have been identified and optimal observation, calibration and imaging strategies for individual cases suggested. The report has been reviewed by international expert panel nominated by ESO.\n\n\n
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ALMA Development Plan Study: Solar Research with ALMA. Progress Report
Brajša, R. ; Bárta, Miroslav ; Skokić, Ivica ; Bastian, T.S. ; Shimojo, M. ; White, S. M. ; Iwai, K.
A mid-term progress report of the research/development project Solar Research with ALMA: Development study. The project has been demanded by ESO to the Czech node of the European ALMA Regional Center. The main goal of the project is development of the specific Solar Observing Mode for ALMA observatory. The report on demand of ESO summarizes results of the WP2: Observing modes and ALMA software requirements. Technical ALMA requirements of solar observing mode are studied and summarised. The ALMA user software was reviewed and its changes complying with the Solar Observing Mode has been proposed. The report has been reviewed by international expert panel nominated by ESO.\n\n\n
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