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Very low and low frequency (VLF/LF) data recorded in the Far Eastern stationsPetropavlovsk-Kamchatsky (158.92° E, 53.15° N),Yuzhno-Sakhalinsk (142.75° E, 46.95° N) and Yuzhno-Kurilsk(145.861° E, 44.03° N) are investigated to study themeteorological effects in the lower ionosphere. The results demonstrate thesensitivity of the VLF/LF signals to the variations of atmospheric pressure,humidity, wind velocity and temperature, and the VLF/LF record at the stationof Yuzhno-Kurilsk is found to be most sensitive to those variations ofatmospheric parameters. The region under consideration is characterized byhigh winter cyclonic activity in mid-latitudes and strong summer and autumntyphoon activity in low latitudes. VLF/LF signal variations during eighttropical cyclones (TCs) with different intensity are considered. Negativenighttime anomalies in the signal amplitude that are most probably caused byTC activity are found for six events. Those anomalies are observed during1–2 days when TCs move inside the sensitivity zones of the subionosphericpaths. Perturbations of the VLF signal observed during two TCs can be causedby both the TC influence and seismic activity, but no correlation between TCintensity and magnitude of the signal anomalies is found. Spectral analysisof the typhoon-induced disturbed signals revealed the fluctuations with timeperiods in the range of 7–16 and 15–55 min that corresponds to the rangeof internal gravity waves periods

Meteorological effects in the lower ionosphere as based on VLF/LF signal observations