Two basic “geometric” effects manifest themselves as slow variations in the properties of the microwave radiation of the active region passing through the solar disk, namely 1) sign inversions of the circular polarization and 2) characteristic peaks of the brightness temperature at certain longitudes on both sides of the central solar meridian and depression near it. These effects are related to the magnetic directivity of the cyclotron radiation governing in the centimeter wavelength range above large spots. The concept of “normal” passage of the active region through the solar disk is introduced in this paper on the basis of studying the mentioned effects observed at two wavelengths, 5.2 cm (Siberian Solar Radiotelescope, Buryatiya) and 1.76 cm (Radioheliograph in Nobeyama, Japan), to separate the “normal,” or “geometric” effects, in the behavior of the microwave radiation from the evolutional effects that may cause high-power solar flares.
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Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Radiofizika, Vol. 51, No. 8, pp. 641–659, August 2008.
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Bakunina, I.A., Smolkov, G.Y. & Snegirev, S.D. On “geometric” effects in the microwave radiation of active regions passing through the solar disk. Radiophys Quantum El 51, 579–596 (2008). https://doi.org/10.1007/s11141-008-9064-0
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DOI: https://doi.org/10.1007/s11141-008-9064-0