On latitudinal variations of temporal characteristics of the VLF chorus in the upper ionosphere |
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Authors: | František Jiříček Pavel Tříska E E Titova T A Yakhnina O A Maltseva Reviewer S Fischer |
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Institution: | (1) Geophysical Institute, Czechosl. Acad. Sci., Bo ní II, 141 31 Praha 4-Spo ilov., SSR;(2) Polar Geophysical Institute, Cola Branch Acad. Sci. of the USSR, 184200 Apatity, USSR;(3) Physical Institute, Rostov Univ., 344090 Rostov/Don, USSR |
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Abstract: | Summary The elements of the VLF chorus, observed simultaneously at a ground station and satellite in polar orbit, can be used to determine the differences in the arrival times of waves ![Delta](/content/j0362v4138162130/xxlarge916.gif) and their dependence on latitude. Mostly ![Delta](/content/j0362v4138162130/xxlarge916.gif) does not change practically over a wide range of latitudes, however, in some cases it may increase appreciably at low value of L. Model computations of the propagation time, based on the assumption that the source of the chorus is located close to the equatorial plane, have indicated the possibility of explaining the increase in ![Delta](/content/j0362v4138162130/xxlarge916.gif) at low latitudes by the presence of a step in the electron density profile close to this plane.
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