Some Characteristics of F-Layer Irregularities Deduced from Backscatter Soundings Made with a Slewable Antenna Having a Two-Degree Azimuthal Beamwidth
STANFORD UNIV CA STANFORD ELECTRONICS LABS
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A study of the F-layer of the ionosphere made with an HF backscatter radar using a narrow-beam antenna has revealed a large number of irregularities in the size range from 50 to 500 km in north-south extent. It was possible to divide these irregularities into 5 types which were named spot, line, split, step, and range variable. On the basis of 60 one-hour records, the probability of the occurrence of each type was estimated spot 60 split 90 others less than 20 of the time. North-south motion of the irregularities was observed, but it occurs less than 10 of the time and always with movement from north to south. When observed, the average velocity of movement is of the order to 1000 kmhr. On occasion, growth and fade of the irregularities was noticed, with the time from start of growth of time of fade-out being of the order of 10 to 15 minutes.
- Atmospheric Physics