The ionospheric F region over El Cerillo, Mexico on magnetically quiet conditions

Abstract

Using data of foFl and foF2 selected under magnetically quiet conditions, the behavior of the Fl and F2 layers over El Cerrillo, Mexico is described. The F1 layer has a similar behavior to the normal E layer with respect to solar control, especially during periods of low solar activity. During high solar activity, maxima appear near the equinoxes and minima near the solstices. This is a result of the semiannual effect observed in the F2 layer. The depression at 0500 LMT, the seasonal anomaly during high solar activity, and the semiannual variation are all clearly observed.