Abstract
A low-cost antenna dedicated to wide range lightning magnetic field registration was presented. The bidirectional magnetic field sensor with preamplifier circuit was developed to operate at the local lightning detection station in Rzeszow, Poland. A calibration factor and effective area of the sensor were obtained from laboratory measurements. The calibration setup was made of a Helmholtz coil and arbitrary generator. The preamplifier was designed as a two stage circuit consisted of an integrator and amplifier. This construction linearized the sensor and fit it to the required antenna range. Measured frequency characteristics of the antenna showed a stable distribution of the calibration factor in the bandwidth corresponding to major components of cloud-to-ground lightning. Registrations from the station in Rzeszow were compared with corresponding data from the lightning location system and theoretical formulae for the lightning current estimation. Contrary to the most of commercially used lightning magnetic field antennae, this antenna was specifically designed for registration in a close and the middle distance of several kilometers from the lightning channel. Registration in this range can be applied for identification of lightning features not yet reported by modern lightning location systems.
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