Detection of the 4th harmonica in the cyclotron radiation above the spot
Radiation of the 4th harmonica of the gyro-frequency in the Solar corona above the spot was detected due to detailed spectroscopic observations at RATAN-600 with high-accuracy polarization measurements. The cyclotron radiation of the 4th harmonica is confirmed by detailed model calculations and the detected event is physically interpreted.
For the first time, the observed manifestations of the cyclotron radiation in the 4th harmonica of the gyro-frequency were obtained. Model calculations confirmed the observed results. The significance of the result obtained is determined by the importance of measurements of the distribution of coronal magnetic fields in those areas of the solar atmosphere, where traditional methods based on the Zeeman and Hanle effects are inefficient due to high coronal temperatures.
The result was presented at the "Solar and Solar-Terrestrial Physics 2017" XXI Russian Annual Conference on Solar Physics