Влияние внезапного стратосферного потепления в январе 2009 г. на распространение коротких радиоволн в экваториальной ионосфере

Abstract

For the first time, we consider the effect of the January 23–27, 2009 sudden stratospheric warming (SSW) event on HF radio wave propagation in the equatorial ionosphere. This event took place during extremely low solar and geomagnetic activity. We use the simulation results obtained with the Global Self-consistent Model of the Thermosphere, Ionosphere and Protonosphere (GSM TIP) for simulating environmental changes during the SSW event. We both qualitatively and quantitatively reproduce total electron content disturbances obtained from global ground network receiver observations of GPS navigation satellite signals, by setting an additional electric potential and TIME-GCM model output at a height of 80 km. In order to study the influence of this SSW event on HF radio wave propagation and attenuation, we use the numerical model of radio wave propagation based on geometrical optics approximation. It is shown that a sudden stratospheric warming leads to radio signal attenuation in the day-time equatorial ionosphere.