Connection between the upper ionospheric region of VLF chorus occurrence and the plasmapause position |
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Authors: | František Jiříček Pavel Tříska O. A. Maltseva E. E. Titova T. A. Yakhnina Reviewer S. Fischer |
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Affiliation: | (1) Geophysical Institute, Czechosl. Acad. Sci., Boní II, 141 31 Prana 4-Spoilov, SSR;(2) Physical Institute, Rostov Univ., 344090 Rostov/Don, USSR;(3) Polar Geophysical Institute, Kola Branch Acad. Sci. of the USSR, 184200 Apatity, USSR |
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Abstract: | Summary The occurrence zone of the VLF chorus in the upper ionosphere appears at L-shells lower than plasmapause position Lpp; with increasing geomagnetic activity the spatial dimension of the zone diminishes, its upper boundary being shifted in correspondence with the plasmapause position, the lower remaining practically without change(L=2.0÷2.5). Calculations of propagation paths have shown that the similarity of the VLF chorus spectrum at different upper-ionospheric latitudes as well as the large spatial dimension of the zone of observation can be explained as special features in the propagation of VLF waves from an equatorial source, starting in the vicinity of the plasmapause with different initial normal angles.
a umauu u ana amu L-, u Lpp(Lpp — nu nana); uu aum amumu nmam a am, nu aua am mmmuu uu nu nana, a u mam namuu u(L=2.0÷2.5). am mamu naam, m n¶rt;u nm a au uma u, ma a nmam ama a¶rt;u, m m mu anmau m amua umua, an amu nana, uu au au. |
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