Die Frequenzabhängigkeit der ionosphärischen Absorption: Julius Bartels zum 60. Geburtstag Gewidmet

Abstract

Detailed analysis has shown that in most cases where observations did not follow the writers' old formula L = B/( f + fL) 2 + N . Δ 3( f 0 E/ f), intense echos from a blanketing E s -layer were present. The theory is generalized to the case of a thin, mirror-like E s -layer embedded into a parabolic E-layer (model D). This gives a new function depending on a second parameter given by the altitude of the mirror. By application of the new formula (with the actual parameters of each observation) we obtain a much better description of the observed frequency variation. Noon values of B (non-deviative D-absorption and N (deviative E-absorption) show opposed seasonal variations, N increasing but B decreasing with the sun's height. The variation of N can be explained satisfactorily by a small decrease of the altitude of the E-layer with increasing height of the sun.