Faraday polarization fluctuations associated with amplitude scintillations at Lunping |
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| Institution: | 1. Department of Physics, Dibrugarh University, Dibrugarh, Assam, India 786004;2. Telecommunication Training Institute, Taipei, Taiwan 22077;1. Department of Physics, University of Kashmir, Hazratbal, Srinagar, J & K 190006, India;2. National Atmospheric Research Laboratory (NARL), Department of Space, Government of India, Gadanki, Tirupati AP-517112, India;3. Islamic University of Science and Technology, Kashmir, J & K 192122, India;1. Indian Institute of Geomagnetism, Navi Mumbai 410218, India;2. School of Environmental Science, Jawaharlal Nehru University, New Delhi, India;1. Department of Physics, Andhra University, Visakhapatnam 530003, India;2. Indian Institute of Geomagnetism, Navi Mumbai 410218, India;3. Physical Research Laboratory, Ahmedabad 380009, India |
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| Abstract: | The diurnal, seasonal and solar cycle variations of Faraday polarization fluctuations (FPF) associated with amplitude scintillations observed at Lunping, Taiwan (25.0°N, 121.2°E : geographic) during the period 1978–1981 are presented. The occurrence of polarization fluctuations is maximum in the premidnight hours. FPFs occur either simultaneously or with a time lag after the onset of amplitude scintillations. There is an increase in FPF activity with an increase in sunspot activity. Occurrence of FPF peaks in the equinoxes. There had been a moderate activity in summer while the winter occurrence is a minimum. The seasonal occurrence pattern compared with reports from other locations indicates a longitudinal control on FPF activity. The maximum probable duration of FPF ranges from 15 to 30 min. It was found that the association of FPF with range spread-F is much better than that with frequency spread-F. Large ambient ionization densities corresponding to plasma frequencies greater than 15 MHz appear to create a favourable environment for the occurrence of FPF. |
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