On the reliability of the inversion aimed to reconstruct global lightning activity based on Schumann resonance measurements

Prácser, Ernő and Bozóki, Tamás (2022) On the reliability of the inversion aimed to reconstruct global lightning activity based on Schumann resonance measurements. JOURNAL OF ATMOSPHERIC AND SOLAR-TERRESTRIAL PHYSICS, 235. ISSN 1364-6826

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Abstract

The electromagnetic field generated by lightning is measured at extremely low frequencies (<100 Hz) in many places on Earth. These measurements are called Schumann resonance (SR) measurements. From SR measurements the location and intensity of global lightning activity can be estimated by applying an in-version algorithm. In this paper, we present an inversion approach based on singular value decomposition (SVD) for this problem and we describe some quality features of the applied inversion technique. The inversion algorithm is tested on synthetic data and the reliability of the obtained results is examined based on the described quality features. Our synthetic tests confirm that the described quality features are very useful in determining the reliability of in-version results. An important conclusion from the synthetic tests is that the quality of the inversion is not adversely affected by incorrect assumptions about the location of the lightning sources.

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