Bulg. J. Phys. vol.35 no.3 (2008), pp. 223-234

On Some Observations of Solar and Terrestrial Phenomena by Subionospheric Transmitted Signals

S.S. De1, B. Bandyopadhyay1, B.K. De2, S. Paul1, D.K. Haldar1, S. Barui1, S. Bhattacharya1
1Centre of Advanced Study in Radio Physics and Electronics, University of Calcutta, Kolkata 700 009, India
2Department of Physics, Tripura University, Tripura 799 130, India
Abstract. Continuous monitoring of VLF/LF sferics and subionospheric transmitted signals are being continued over Agartala (Lat 23o N, Long 91o>/sup> 24' E), North-Eastern part of India, since 1975. From the recording of one such subionospheric signal at 40 kHz from Japan (Lat 36o11' N, Long 139o51' E), some observed typical variations in the transmitted signal amplitude during solar flares and meteor showers will be presented in this paper. The effects of perturbation in the lower ionosphere due to solar flare and occurrence of Leonid meteor showers upon subionospheric signal at 16.3 kHz transmitted from VTX1 Indian Navy station located at Vijayananarayanam (Lat 8o25'59.88'' N, Long 77o48' E), have been detected over Kolkata (Lat 22o34' N, Long 88o30' E). Some results of observations will also be exhibited here.

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