Abstract
Observations of ionisation elongated along the earth's magnetic field have been carried out with a sensitive radar at a frequency of 300 Mc/s. A very weak signal was detected from a height of about 104 km and this was found to be present almost continuously even during very quiet magnetic conditions. The weak signals are believed to originate from field-aligned ionisation of meteoric origin. This means that in certain parts of the E-region there is a radar noise level much greater than that set by incoherent backscatter from the free electrons of the ionosphere.
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