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| Titel |
Meteorological effects in the lower ionosphere as based on VLF/LF signal observations |
| VerfasserIn |
A. Rozhnoi, M. Solovieva, B. Levin, M. Hayakawa, V. Fedun |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1561-8633
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| Digitales Dokument |
URL |
| Erschienen |
In: Natural Hazards and Earth System Sciences ; 14, no. 10 ; Nr. 14, no. 10 (2014-10-01), S.2671-2679 |
| Datensatznummer |
250118705
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| Publikation (Nr.) |
 copernicus.org/nhess-14-2671-2014.pdf |
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| Zusammenfassung |
| Very low and low frequency (VLF/LF) data recorded in the Far Eastern stations
Petropavlovsk-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 the
meteorological effects in the lower ionosphere. The results demonstrate the
sensitivity of the VLF/LF signals to the variations of atmospheric pressure,
humidity, wind velocity and temperature, and the VLF/LF record at the station
of Yuzhno-Kurilsk is found to be most sensitive to those variations of
atmospheric parameters. The region under consideration is characterized by
high winter cyclonic activity in mid-latitudes and strong summer and autumn
typhoon activity in low latitudes. VLF/LF signal variations during eight
tropical cyclones (TCs) with different intensity are considered. Negative
nighttime anomalies in the signal amplitude that are most probably caused by
TC activity are found for six events. Those anomalies are observed during
1–2 days when TCs move inside the sensitivity zones of the subionospheric
paths. Perturbations of the VLF signal observed during two TCs can be caused
by both the TC influence and seismic activity, but no correlation between TC
intensity and magnitude of the signal anomalies is found. Spectral analysis
of the typhoon-induced disturbed signals revealed the fluctuations with time
periods in the range of 7–16 and 15–55 min that corresponds to the range
of internal gravity waves periods. |
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