Conjugate measurements of VLF transmitter signals at middle latitude (L = 1.93) |
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| Institution: | 1. Indian Institute of Geomagnetism, Kalamboli Highway, New Panvel, Navi Mumbai 410218, Maharashtra, India;2. KSK Geomagnetic Research Laboratory, Hanumanganj, Allahabad 221505, India;3. School of Engineering and Physics, The University of South Pacific, Suva, Fiji;4. Aryabhatta Research Institute of Observational Sciences, Nainital, India;5. Atmospheric Research Laboratory, Department of Physics, Banaras Hindu University, Varanasi 221005, India;6. Indian Institute of Tropical Meteorology, Pune, India |
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| Abstract: | Whistler-mode signals were measured at the conjugate point (L = 1.93) in South Australia of the VLF transmitter in Eastern U.S.S.R. The intensity of whistler-mode signals increased usually at sunset and occasionally at sunrise, and was moderate during night-time. By means of the calculation of the wave attenuation in the lower ionosphere, the result may be interpreted in terms of different mechanisms of propagation in the magnetosphere and transmission out of the ionosphere: spatially coherent propagation in a field-aligned duct and transmission out of the duet onto the ground at sunset and sunrise; and spatially incoherent propagation and transmission at night. A high correlation was found between the occurrence probability of the 14.881 kHz whistler-mode signals and the occurrence number of whistlers, which may suggest that the occurrence of whistlers is controlled predominantly by propagation conditions. |
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