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An integral parameter for estimating the ionospheric and lightning activity (Ionosphere & Lightning Intention Index, I&LII) has been proposed. This parameter is derived from the spectrogram of a signal recorded in the frequency range of 9 to 11 kHz at a World Wide Lightning Location Network (WWLLN) station in real time.

This paper describes the implementation of the autonomous infrasonic sensor for thunderstorm events recognition. Original hardwaremicrocontroller system with microphones, GPS-based time synchronization and GPRS-modem data transmission is described. The characteristics as calibration results is reviewed.

Abstract. Installation of modern highly sensitive magnetometric equipment at geophysical observatories requires location of places with a low level of magnetic noise. It is also required to perform regular control of noise environment at observatory instrument installation points. This work is aimed at testing one of the prototypes of magnetic noise measuring instruments, capable of performing fast areal measurements. The key features of this prototype are high sensitivity and linearity and capability of registration of magnetic noise in different frequency bands. This work was supported by the Russian Science Foundation (project No. 17-77-20034).

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