Abstract
We have performed a spectral analysis of variations in the Ez component of a quasistatic electric field in the atmospheric surface layer in a wide band of internal gravity waves (from 5 min to 3 h) for quiet and seismically active conditions as well as high thunderstorm activity. Observational data of the field for September, 1999 and August–September, 2002, were used. It has been shown that, if there are no thunderstorms or earthquakes, the background spectrum includes oscillations with maxima at periods of T ∼ 1.8 and 1 h, 40, 30, 15, and 10–13 min. Their intensity in the range of periods of 0.5–3.0 h is two or more orders of magnitude higher than the intensity of maxima in the range of 5–30 min. Before earthquakes, with anomalies in diurnal variations of field intensity, there is a tendency of increased background spectrum at maxima noted there. In both ranges of oscillation periods, the spectral intensity increases by one to one and a half orders of magnitude. Under high thunderstorm activity, the variability is higher as compared to the spectra of earthquake precursors by both locations of maxima and their intensity. The intensity of maxima exceeds the maxima on the eve of earthquakes one to one and a half orders of magnitude in the range of periods 0.5–3.0 h and two and more orders of magnitude in the range of periods 5–30 min.
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