Analysis of Occurrence of Sporadic E and Accuracy of Predictions of Sporadic-E Critical Frequencies for Temperate Latitude Northern Hemisphere Stations,

摘要

A study was conducted to determine: (a) percentage of time that sporadic E was observed at fifteen locations during four years (1965, 1967, 1969,and 1971),and (b) the accuracy of sporadic-E predictions based on the ITS numerical coefficients. Results indicate that: (a) sporadic E is present almost 50% of the time during summer at mid-latitudes and at night in the high latitudes,and (b) updated coefficients may well predict the general trend of observations more closely than the current coefficients.