Application of matched filtering and parameter estimation technique to low latitude whistlers |
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| Institution: | 1. Atmospheric Research Laboratory, Physics Department, Banaras Hindu University, Varanasi, 221 005, India;2. Geophysical Department, Eötvös University, Budapest, Pf. 32, H-1532, Hungary;1. Center of Advanced Electronic and Communication Engineering, Universiti Kebangsaan Malaysia, 43600 Bangi, Selangor, Malaysia;2. Space Science Centre (ANGKASA), Institute of Climate Change, Universiti Kebangsaan Malaysia, 43600 Bangi, Selangor, Malaysia;3. Geomatic Innovation Research Group, Faculty of Science, Universiti Teknologi Malaysia, 81310 Johor Bahru, Johor, Malaysia;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: | The Matched Filtering and Parameter Estimation (MFPE) technique developed for the analysis of mid/high latitude whistlers has been extended to analyze whistlers recorded at low latitude ground station Varanasi, India (geomagnetic latitude 14° 55′ N, longitude 153° 59′ E, L=1.07). Some of the whistlers recorded at Varanasi are found to have propagated along higher L-values (L>2). It has been argued that these whistlers after exiting the ionosphere have propagated towards the equator in the Earth-ionosphere waveguide. Trace splitting is observed below the nose frequency and above 2.0 kHz, a result in agreement with mid/high latitude whistlers. The trace splitting structure revealed by MFPE demonstrates the complexities of whistler wave propagation and is quite helpful in deriving information about high resolution features of the duct structure. The banded features observed in the dynamic spectrum are clearly seen in the output of the matched filter. The observed banded features may arise due to interference between the wavelets propagating in the duct/waveguide. |
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