ON THE POSSIBLE EXISTENCE OF AN EAST-WEST, F-LAYER, ELECTRON-DENSITY TROUGH EXTENDING ACROSS THE UNITED STATES
STANFORD UNIV CA STANFORD ELECTRONICS LABS
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It has been suggested that recent satellite topside sounding data seems to show a trough or localized minimum of electron density lying latitudinally across the United States. The characteristics and implications of such an F-layer anomaly have been investigated by surveying and analyzing available topside and bottomside sounding information. A trough does appear in some of the data, and it appears to have diurnal, yearly, and sunspot cycle variations. However, even during these apparent periods of highest probability of occurrence, it is not observed in any of the surveyed single-pass data, but rather only in the average of many observations where it still is not reliably seen. The conclusion was reached that, although the existence of such an anomaly in F-layer electron density would have an effect on HF point-to-point communications maximum usable frequencies, owing to its infrequent occurrence and little understood nature, the possible existence of the anomaly should not be used as a design consideration in the layout of actual or proposed HF communications circuits across the U.S.
- Atmospheric Physics
- Radiofrequency Wave Propagation