Radar observations of weak field-aligned ionisation at a frequency of 300 Mc/s
作者： C.D. Watkins , H.K. Sutcliffe
DOI: 10.1016/0021-9169(65)90032-2
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摘要: Abstract Observations of ionisation elongated along the earth's magnetic field have been carried out with a sensitive radar at frequency 300 Mc/s. A very weak signal was detected from height about 104 km and this found to be present almost continuously even during quiet conditions. The signals are believed originate field-aligned meteoric origin. This means that in certain parts E-region there is noise level much greater than set by incoherent backscatter free electrons ionosphere.
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