Temporal variations in high frequency ionospheric radio wave absorption at mid-latitudes

Details Temporal variations in high frequency ionospheric radio wave absorption at mid-latitudes Temporal variations in high frequency ionospheric radio wave absorption at mid-latitudes

Apr 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977jatp...39..475r&link_type=abstract

Journal of Atmospheric and Terrestrial Physics, vol. 39, Apr. 1977, p. 475-480.

Physics

Annual Variations, Electromagnetic Absorption, High Frequencies, Ionospheric Propagation, Midlatitude Atmosphere, Radio Attenuation, E Region, Electron Recombination, Frequency Response, Nitric Oxide, Solar Activity Effects, Time Dependence

Scientific paper

The seasonal variation in noon vertical incidence absorption has been examined for long-term measurements at de Bilt, Freiburg and Slough, for frequencies in the range 1.7-5.8 MHz. The delay (phi) between maximum absorption and maximum cos chi has been found to depend on frequency (f) and solar activity. The absorption in a model ionosphere has been calculated for E-region frequencies and it is found that the introduction of a time-dependent nitric oxide profile yields theoretical phi-f curves similar to those observed experimentally.

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