Observations of whistlers during quiet times made at low-latitude ground station Nainital (geomag. lat. 19" 1' N) are used to deduce plasmasphero-ionosphere coupling fluxes. The whistler data from 3 magnetically quiet days are presented that show a smooth decrease in dispersion with time. This decrease in dispersion is interpreted in terms of a corresponding decrease in electron content of tubes of ionization. The electron densities, electron tube contents (1016 el/m2-tube) and coupling fluxes (10 el m-l sT2) are computed by means of an accurate curve fittingmcthod developed by Tarcsai (1975) and are in good agreement with the results reported by other workers.
Particular emphasis is laid on the application of whistlers recorded at low latitude ground station, Nainital during magnetically quiet times to estimate the eastward/westward electric field in the plasmasphere. The east-west components of electric field during quiet magnetic (average Kp = 1) are obtained for the first time from low latitude station on the basis of the available whistler data on Tarcsai (1975). Our measurements demonstrate an average estimated electric field of-0.06 mVm 1 in the premidnight local time sector and an average westward electric field of -0.05 mVm I in the post-midnight local time sector. These values are in good agreement with similar results reported by earlier workers. Near midnight there is a sharp transition from eastward field to westward electric field. The electric fields during quiet days at low latitudes are thought to be generated by the dynamo mechanism.
Making use of currently available theory of wave absorption, an attempt has been made to estimate the refractive indices and absorption coefficients for different wave frequencies during day and night times in the Jovian ionosphere. The results obtained have striking similarity with the corresponding results in the case of the Earth's ionosphere. It is concluded that VLF signals can be observed more easily during night times.
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