Summary
Radar observations of two pre-monsoon tornadoes as experienced over the Gangetic West Bengal and the integrated field intensity of atmospherics (IFIA) at 30 kHz recorded over the tropical station, Calcutta, have been analysed. The records of IFIA exhibit a pronounced variation in the noise level showing first a sudden enhancement and then a distinct fall which is repetative in nature in both the cases. The characteristics of the variations are analysed and discussed. The synoptic situations in connection with both the tornadoes have also been critically studied. The results obtained are explained by considering the existing knowledge of electrical activity.
Zusammenfassung
Es werden Radarbeobachtungen von zwei in der Vor-Monsunzeit über West-Bengalen aufgetretenen Tornados und die an der tropischen Station Calcutta registrierte integrierte Feldstärke der Atmospherics (IFIA) bei 30 kHz analysiert. Die Registrierungen der IFIA zeigen eine auffallende Änderung im Niveau mit einem anfangs plötzlichen Anstieg und einem darauffolgenden deutlichen Abfall mit Wiederholungen dieser Art in beiden Fällen. Die Charakteristiken dieser Änderungen werden analysiert und besprochen. Die synoptischen Verhältnisse werden im Zusammenhang mit beiden Tornados kritisch untersucht. Die gewonnenen Ergebnisse werden aus der Kenntnis der elektrischen Aktivität erklärt.
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Bhattacharya, A.B., Bhattacharya, R. Radar observations of tornadoes and the field intensity of atmospherics. Arch. Met. Geoph. Biocl. A. 32, 173–179 (1983). https://doi.org/10.1007/BF02272722
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DOI: https://doi.org/10.1007/BF02272722