We propose a new method which allows measuring the tilt angle of the sunspot magnetic field axis from the vertical position in the solar corona. The method is founded on the сharacteristic feature of the cyclotron radiation – an intense depression along the magnetic field.
The method consists in an analysis of time-varying sunspot picture at microwave owing to the
Sun rotation, that is changes of the sight angle. Results measuring are given for main sunspots in active regions NOAA 11899 and NOAA 11944 using radio telescopes RATAN-600
and NoRH observations. Our study revealed that the tilt angle increases with a rise of an elevation above the photosphere, at the level of (2–3)×10³ km it lies in the range of ~ 10°
(e-mode) and ~ 3° (o-mode).