An analog extremely-low-frequency-very-low-frequency atmospheric noise spectrum analyzer on programmable integrated circuits

A functional diagram of the analog extremely-low-frequency-very-low-frequency atmospheric noise spectrum analyzer is presented and its characteristics and spectrum record examples are given. The joint use of programmable analog and digital integrated circuits allows a unit being in the operating state to change in real time such basic parameters of the analyzer as the number of analysis points, characteristics of the analyzing filter, and scanning time of the frequency spectrum. Studying the signals of the lightning generator (of atmospheric noises) provides important information for studying both the atmospheric electricity and the electromagnetic wave propagation medium (earth-ionosphere waveguide).