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Anomalous polarization features of the cyclotron radiation source in the NOAA 7123 active region: The structure, dynamics, and reasons of occurrence |
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| Authors: | N G Peterova N A Topchilo L V Opeikina B V Agalakov T P Borisevich B I Lubyshev |
| Institution: | 1. St. Petersburg Branch, Special Astrophysical Observatory, Russian Academy of Sciences, St. Petersburg, Russia 2. Sobolev Astronomical Institute, St. Petersburg State University, St. Petersburg, Russia 3. Special Astrophysical Observatory, Russian Academy of Sciences, N. Arkhyz, Russia 4. Irkutsk State Technical University, Irkutsk, Russia 5. Central Astronomical Observatory, Russian Academy of Sciences, St. Petersburg, Russia 6. Institute of Solar-Terrestrial Physics, Siberian Branch, Russian Academy of Sciences, Irkutsk, Russia |
| Abstract: | The research results of the unique NOAA 7123 active region (April 1992) are presented; its anomalous polarization features (long-term predominance of O-mode radiation above the central part of the main sunspot) were previously revealed by VLA observations with a resolution of (2–4)” at wavelengths of 3.6 and 6.4 cm (Vourlidas et al., 1997). Additional observations in a wider band of electromagnetic radiation, including, in particular, spectrum-polarization observations performed with the RATAN-600 and SSRT radio telescopes, are considered. The analysis of these data allowed for the conclusion that the anomaly was caused by the presence of a cold substance in the upper coronal layers, starting from the height where (6–7) cm radiation was generated. A possible transportation agent of this substance—Hα filament—one of the bases of which fell on the sunspot’s umbra-penumbra boundary, was found. |
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