Abstract Hourly monthly median values of the F2-layer critical frequency, foF2, measured at some European stations over one solar cycle at least, are fitted to the linear regression model foF2=aR+b. The coefficients a and b are determined for constant cosχ values for each month in each station. The results show that the most responsible for the winter-summer anomaly is the coefficient a, although b has before mid-day a smaller value in summer than in winter. On the contrary, from about mid-day up to sunrise b is greater in summer than in winter, so that it shows a diurnal anomaly. These anomalies seem to be related to corresponding variations of the composition of the neutral atmosphere at ionospheric heights.
Behaviour of foF2 over European mid-latitudes
Advances in Space Research ; 13 , 3 ; 53-56
1993-01-01
4 pages
Article (Journal)
Electronic Resource
English
Appendix to behaviour of foF2 over European mid-latitudes
Elsevier | 1993
|Behaviour of foF2 over European Mid-Latitudes (Figures 1-3 in Appendix)
Online Contents | 1993
|Variability of foF2 at Low and Middle Latitudes
British Library Conference Proceedings | 1998
|CHAPTER 3. STORM AND DISTURBANCE EFFECTS - Variability of foF2 at Low and Middle Latitudes
Online Contents | 1998
|