Matched filtering-parameter estimation method and analysis of whistlers recorded at Varanasi |
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Authors: | R P Singh R P Patel Ashok K Singh D Hamar J Lichtenberger |
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Institution: | (1) Atmospheric Research Laboratory, Physics Department, Banaras Hindu University, 221 005 Varanasi, India;(2) Department of Geophysics, Eotvos University, Budapest, Hungary |
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Abstract: | The matched filtering technique is based on the digital-construction of theoretical whistlers and their comparison with observed
whistlers. The parameters estimated from the theoretical and experimental whistler curves are matched to have higher accuracy
using digital filters. This yields a resolution ten times better in the time domain. We have tested the applicability of this
technique for the analysis of whistlers recorded at Varanasi. It is found that the whistlers have propagated along L>2 and have wave normal angles after exiting from the ionosphere such that they propagate towards equator in the earth-ionosphere
wave-guide. High-resolution analysis shows the presence of fine structures present in the dynamic spectrum. An effort is made
to interpret the results. |
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Keywords: | Matched filtering fine structure ducted mode propagation banded whistlers |
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