High Accuracy Measurements of Prominences Polarization Emission at Radio Wavelengths Using RATAN-600 Observations
The regular solar limb observations at RATAN-600 radio-telescope show that the prominence emissions with high signal/noise ratio at several wavelengths in microwave range are registered. The observations with the Panoramic Analyzer of Spectrum working in the range 0.9 GHz - 18 GHz with 5% frequency resolution at 45 wavelengths in right and left circular polarization with one horn are used. In the work we take advantage of both high-resolution (14") and multi-frequency observations (11 wavelengths in the range 1.83-3.57 cm). Accurate determination of temperature and polarization analysis (0.2%) as a function of wavelength is important, since it can provide information on the density and temperature structure of the prominence threads, which in turn determines the amount of thermal and magnetic energy in eruption stages. The magnetic field of prominences at the heights of (80-100) times 1000 km (both weak and strong fields, respectively, 10-20 G and 75-100 G), gradient of temperature and emission measure were measured. The accuracy of magnetic field measurements is 5 G. Observed flux spectrum corresponds to optically thick radiation with constant temperature T = 12 000 plus or minus 1 000 K.
IAU Joint Discussion
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