Belgibaev, Ruslan, Dmitriy Ivanov, Vladimir Ivanov, Natalya Ryabova, and Maria Ryabova. 2016. “ENGINEERING DEVELOPMENT OF PASSIVE IONOSONDE TO STUDY THE EFFECT OF THE BLACKOUT ON HF COMMUNICATION”. Journal of Applied Engineering Science 14 (4). https://doi.org/10.5937/jaes14-9286.