Abstract
Propagation characteristics of low latitude whistler duct characteristics have been investigated based on day-time measurements at Jammu. The morphogical characteristics of low latitude whistlers are discussed and compared with characteristics of middle and high latitude whistlers. The Max. electron density (Nm) at the height of the ionosphere obtained from whistler dispersion comes out to be higher than that of the background which is in accordance with the characteristics of whistler duct. The equivalent width is found to be close to the satellite observations and the characteristics of whistler duct in low latitude ionosphere are similar to those in middle and high latitude ionosphere. The width of ducts estimated from the diffuseness of the whistler track observed during magnetic storm is found to lie in the range of 50 - 200 Km.
Highlights
Ground based whistlers are known to generally attribute to propagate trapped in field aligned whistler ducts at high and middle latitudes [1,2] and lower latitudes [3,4]
The Max. electron density (Nm) at the height of the ionosphere obtained from whistler dispersion comes out to be higher than that of the background which is in accordance with the characteristics of whistler duct
The estimation of duct width by using the low latitude whistlers and Satellite observations has been discussed by many workers
Summary
Ground based whistlers are known to generally attribute to propagate trapped in field aligned whistler ducts at high and middle latitudes [1,2] and lower latitudes [3,4]. Whistlers which are VLF electromagnetic signals, travel through the ionosphere-magnetosphere coupled system along the geomagnetic field lines to the magnetically conjugate points in the opposite hemisphere have become a very important tool for probing the plasma sphere and beyond. During their propagation through the magnetosphere these whistler waves acquire dispersion characteristic typical of the electron density inhomogenieties present along the whistler path. The physical features and propagation characteristics of low latitude whistlers are the important and interesting subjects in the work of atmospheric research [3]. We have studied the morphology of whistler ducts of daytime recorded at our low latitude ground station Jammu, in the hope that we might be able to deduced some supporting ideas, for the conclusions arrived by previous workers
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