Abstract
The temporal variation of foEs is examined for monthly median data from Athens Ionospheric Station (38.17 N°, 23.6 E°) over the periods Jan. 1961 to Nov. 1965 and June 1966 to Dec. 1973. The median values, for each hour during the above periods are Fourier analysed for 12-months running intervals; 130 sets of coefficients (amplitudes and phases) are calculated. The analysis shows that: 1. a.|The amplitudes and the 12-months mean running average value of sunspot number are linearly related; 2. b.|The daily variations of the Y-intercept and slopes for the amplitudes show a characteristic behaviour; 3. c.|A stability in phases with a decrease in higher components is found. The possibility of evaluating median foEs values, using smoothed coefficients, mean monthly sunspot number, time of the day and number of the day is discussed.
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call