27-day fluctuations in the ionospheric D-region

Details 27-day fluctuations in the ionospheric D-region 27-day fluctuations in the ionospheric D-region

Dec 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jatp...53.1145p&link_type=abstract

(Solar-terrestrial physics; International SCOSTEP Symposium, 7th, The Hague, Netherlands, June 25-30, 1990, Selected Papers. A92

Physics

10

D Region, Ionospheric Propagation, Radio Attenuation, Solar Rotation, Solar Terrestrial Interactions, Thermosphere, Twenty-Seven Day Variation, Lyman Alpha Radiation, Meridional Flow, Solar Activity Effects, Zonal Flow (Meteorology)

Scientific paper

The 27-day fluctuations in ionospheric absorption of radio waves along three radio paths in Central and Southeastern Europe are investigated over the interval 1982-1988 together with analogous fluctuations in the solar Lyman-alpha flux and in the prevailing wind in the lower thermosphere. The 27-day fluctuations in the lower ionosphere are of direct solar origin only if the Lyman-alpha flux exhibits a very well expressed solar rotation variation. The absorption fluctuations are largest in winter near solar activity minimum, in fair coincidence with the maxima of corresponding fluctuations in zonal and particularly meridional winds. This indicates a dynamical forcing (may be of solar origin).

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