Anomalous polarization features of the cyclotron radiation source in the NOAA 7123 active region: The structure, dynamics, and reasons of occurrence

作者：Peterova N G^*; Topchilo N A; Opeikina L V; Agalakov B V; Borisevich T P; Lubyshev B I

来源：Geomagnetism and Aeronomy, 2013, 53(8): 1000-1006.

DOI：10.1134/S0016793213080185

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-H alpha filament-one of the bases of which fell on the sunspot's umbra-penumbra boundary, was found.

• 出版日期2013-12