DETERMINATION OF ELF WAVE CHARACTERISTICS MOST STRONGLY REACTING TO MINOR CHANGES OF IONOSPHERIC ELECTRON DENSITY IN A HIGH-LATITUDE REGION Journal title: Solar-Terrestrial Physics Authors: Akhmetov O. I., Mingalev I. V., Mingalev O. V., Suvorova Z. V., Belakhovsky V. B., Chernyakov S. M. Subject(s): Physics, Atmospheric Sciences