INFLUENCE OF STRONG SOLAR PROTON EVENTS ON PROPAGATION OF RADIO SIGNALS IN THE VLF RANGE IN A HIGH-LATITUDE REGION Journal title: Solar-Terrestrial Physics Authors: Akhmetov O. I., Mingalev I. V., Mingalev O. V., Belahovskiy V. B., Maurchev E. A., Larchenko A. V.,... Subject(s): Physics, Atmospheric Sciences