An Experimental Evidence Of Non-Ducted Propagation During Daytime From The Esd Whistler Observations At Low Latitude Ground Station Jammu |
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| Authors: | Lalmani Babu Madhu Kaul Kumar Rajou Singh Rajesh Singh Krishna Kumar |
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| Institution: | (1) Department of Physics, Regional Engineering College Srinagar, Camp Jammu, Canal, Road, Jammu, 180001, India;(2) Atmospheric Research Lab.,Physics Department; and Applied Physics Department, Institute of Technology, Banaras Hindu University, Varanasi, 221005, India;(3) Applied Physics Department, Institute of Technology, Banaras Hindu University, Varanasi, 221005, India |
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| Abstract: | The propagationmechanism of low latitude daytime whistlers is investigated on the basis of ground measurements made continuously
during daytime in North India at Jammu (geomag. lat. 22°26°N;L = 1.17). On February 14, 1998 extremely small dispersion (ESD)
whistlers with dispersion varying from 5–10 sec1/2 in surprisingly large numbers were recorded at Jammu during daytime in the late afternoon. The results of a study of the
characteristics of ESD whistlers are presented and the discussion indicates that ESD whistlers recorded are the VLF waves
radiated from the return stroke of the lightning discharge launched at the ionosphere with different initial wave normal angles,
propagated upwards under eitherquasi-longitudinal conditions or pro-longitudinal whistler mode, turned around at different
heights due to quasi-transverse propagation and received at Jammu with the dispersion of the order of 5–10 sec1/2. The validity of this suggestion has been tested by performing actualray-tracing computations in thepresence of equatorial
anomaly model.
This revised version was published online in July 2006 with corrections to the Cover Date. |
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| Keywords: | Dispersion magnetosphere whistlers |
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