Physics
Scientific paper
Jan 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975jatp...37..131s&link_type=abstract
Journal of Atmospheric and Terrestrial Physics, vol. 37, Jan. 1975, p. 131-141.
Physics
2
Diurnal Variations, Electromagnetic Absorption, Ionospheric Propagation, Solar Cycles, Atmospheric Attenuation, Atmospheric Models, Collision Rates, D Region, E Region, Incident Radiation, Ionospheric Electron Density
Scientific paper
The diurnal and solar-cycle variations of vertical-incidence absorption at a fixed frequency are shown to depend on the ratio of wave frequency to the E layer critical frequency. Thus results quoted by different workers are sometimes apparently contradictory, unless a correction is made for the changing E layer critical frequency over the measurement period. To represent temporal changes, it is proposed that results should be expressed in terms of the integrated product of electron concentration and collision frequency over the whole of the absorbing region. This can be done by using the form of the dependence of absorption on frequency originally established by George (1971) for noon. By this means, sample multifrequency measured data are shown to give consistent diurnal and solar-cycle variations.
Bradley Paul Andrew
Samuel J. C.
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