Comparison of electron density height profiles of the atmosphere above Tsumeb, SWA, and Lindau

Electron density profiles of the ionosphere above Tsumeb, SWA, were derived from quarterhourly ionograms of noon and midnight intervals throughout 1958; they were processed in the same way as corresponding Lindau profile data some years ago. A comparison verified the validity of the Lindau results also for Tsumeb. It was shown that an analytical description of the F-layer profile parameters above stations between the equatorial and the auroral zone is possible. The standard profile of the F-layer as defined by the author proved to be even more invariant with respect to season above Tsumeb than above Lindau. Finally a very tight correlation was found between F-layer peak heights as well as its thickness parameter and the 10.7 cm solar radio flux measurements by CRC in Ottawa. Even a daily dependence became obvious throughout 1958.