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W2052700996 abstract "The size and position of the regions in the bottomside ionosphere through which downcoming whistlers emerge (whistler exit points) are estimated by ray-tracing calculations in both summer day and winter night models of the magnetospheric plasma. Trapping of upgoing whistler-mode waves both through the base and the side of ducts is considered. The ducts are modelled as field-aligned electron density enhancements, Gaussian in cross-section, which extend down to 300 km altitude. It is found that, for downcoming rays which were trapped in the duct in the summer day model, the limited range of wave-normal angles which can be transmitted from the lower ionosphere to free space below results in the size of the exit point being considerably smaller than the region of incidence. The exit point is found to be ~100 km in size, in agreement with ground-based observations of fairly narrow trace whistlers. All the rays ducted result from trapping through the duct side. For rays trapped in the duct in the winter night model, the size of the exit point is more nearly the same as the range of final latitudes of the downcoming rays in the lower ionosphere. It is also found that the strong latitudinal electron density gradient enables rays started at higher as well as lower latitudes than the duct to become trapped in it. Those started at higher latitudes are trapped at higher altitudes (~6000 km) and result in a significantly larger exit point (~5° of latitude) than for those trapped from lower latitudes. Rays are also found to become trapped in the duct after first passing through it at lower altitude. Rays are not, however, found to be trapped through the duct base." @default.
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W2052700996 date "1981-03-01" @default.
W2052700996 modified "2023-09-27" @default.
W2052700996 title "Determination by ray-tracing of the regions where mid-latitude whistlers exit from the lower ionosphere" @default.
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W2052700996 doi "https://doi.org/10.1016/0021-9169(81)90044-1" @default.
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