Abstract
Results from a partial reflection radar experiment, operated at a frequency of 2.9 MHz at Scott Base, Antarctica, are presented for the time interval from January 1987 to June 1991. It is shown that a layer of ionisation can frequently be identified at scattering heights between 40 and 55 km. Details regarding the maximum density, thickness, and frequency of occurrence of this ionisation layer are presented. From sequential occurrences of the ionisation an approximate life time of 70 min is deduced for the layer. The possibility that the ionisation layer is produced by a flux of relativistic electrons is investigated.
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