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https://doi.org/10.1029/jz069i013p02775
Copy DOIJournal: Journal of Geophysical Research | Publication Date: Jul 1, 1964 |
Citations: 43 |
The heights of ionospheric irregularities responsible for radio satellite scintillation were directly measured by using spaced receivers on 130 passages of Transit 4A. Observed irregularity heights vary from 90 to 800 km. Most of the irregularities were in the F region between 300- and 400-km height. A significant amount of scintillation was caused by irregularities in the E region near 100-km height. E-region scintillation is most probable at midday, F-region scintillation at midnight. Strong positive correlation was found between both E- and F-region scintillation and sporadic-E and spread-F conditions on ionograms. F-region irregularity heights increased, on the average, toward the north. Most individual regions of irregularities were found to have little change of height with latitude. About ⅓ of the passes showed gradual or abrupt height changes, increasing to the north or south with equal probability, in some part of the pass. Height gradients were seldom uniform for distances of more than 50–100 km.
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