%0 Journal Article %T An approach to finding an integral characteristic of ionospheric and lightning activity from WWLLN observational data %A Kudryavtsev, N.G. %A Kudin, D.V. %A Uchaikin, E.O. %K Lightning location, Earth--ionosphere waveguide, ionosphere, lightning, atmospheric electricity, instrumentation/sensors %J Russian Journal of Earth Sciences %D 2018 %N 18 %P 7 %I Geophysical Center of the Russian Academy of Sciences