Features of the HF Signal Propagation on Oblique Sounding Paths During Solar and Magnetic Activity in September 2017

Resumo

We present the results of studying the influence of solar and magnetic activity in September 2017 on the HF signal characteristics on subauroral and midlatitude paths. A connection between the ionospheric effects caused by the magnetic storm and the magnetic disturbance intensity is established. It is shown that the formation of a strong sporadic E_s layer in the auroral ionosphere during a magnetic storm makes it possible to use the propagation mode with reflection from E_s in the interests of HF communication to neutralize the effects of the negative phase of the storm and absorption growth when unfavorable conditions for the F-mode propagation with reflection from the upper ionosphere occur.