The Influence of Cyclonic Activity on the Geomagnetic Field Disturbance

Resumo

The results of observations of geomagnetic disturbances related to cyclonic activity in the troposphere are reported. To reveal these disturbances, we use data on magnetic observations statistically processed for a certain period and data obtained during an individual large cyclone. We propose a physical mechanism by which tropospheric cyclones can produce disturbances in the magnetic field; this mechanism is based on the electrodynamical effect of generation of the magnetic field, while charged clouds move under the action of wind and charged particles precipitate. It has been deduced from the experiments that, in a frequency range of 4.3−8.3 mHz, the dispersion of the magnetic field disturbances may increase by more than two times during cyclone passage above the observational site, as compared to the background values in the cyclone absence. The theoretically estimated amplitudes of the magnetic induction disturbances caused by the cyclone satisfactorily agree with the observational data.