A study of diffused whistlers


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Whistler data were analyzed for making a study of irregularity of the ionosphere, especially field-aligned ducts. A pure dipole geomagnetic field model and the electron number density distribution data were used for estimation of whistler duct width. Estimated duct width is not linearly increased with increasing diffuseness and its relation curve becomes suddenly steep near the 40°latitude. The duct width estimated by diffuseness (dt) varies with geomagnetic latitude, for instance, the duct width becomes 1000-2000km at 30°and 500-700km at 40°for the same diffuseness (dt=15ms).



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