Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975ge%26ae..15..664s&link_type=abstract
Geomagnetizm i Aeronomiia, vol. 15, July-Aug. 1975, p. 664-671. In Russian.
Astronomy and Astrophysics
Astronomy
2
Electromagnetic Absorption, Ionospheric Electron Density, Ionospheric Propagation, Ionospheric Temperature, Lower Ionosphere, Annual Variations, D Region, E Region, Electron Energy, Extraterrestrial Radio Waves, Solar Activity Effects, Vertical Distribution
Scientific paper
The altitude distribution of radio wave absorption in the ionosphere and the profiles of electron temperature at altitudes between 100 and 150 km are obtained on the basis of an analysis of data on the simultaneous measurement of radio wave absorption in the ionosphere during an annual cycle by radio astronomical and pulse methods. It is shown that for the years close to minimum solar activity (W = 10-15) most of the absorption (70 to 85%) occurs in the lower ionosphere (D and E layers). Seasonal variations in the altitude-dependence of absorption is dictated primarily by the seasonal variations in electron density and to a lesser extent by the seasonal variations in electron temperature. In the lower ionosphere, absorption is divided into deflecting and nondeflecting components.
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