Investigations of the winter anomaly in ionospheric absorption in January 1981

Details Investigations of the winter anomaly in ionospheric absorption in January 1981 Investigations of the winter anomaly in ionospheric absorption in January 1981

Feb 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984jatp...46..129p&link_type=abstract

Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 46, Feb. 1984, p. 129-141.

Physics

2

Anomalies, Electromagnetic Absorption, Ionospheric Propagation, Radio Attenuation, Ionospheric Electron Density, Ionospheric Temperature, Kp Index, Solar Flares, Wind Velocity, Winter

Scientific paper

Combined Soviet ground-based and rocket investigations of the winter middle atmosphere in January 1981 show that the regular winter anomaly was extremely strong during the observational period. The anomalous absorption covered a considerable longitude range within the Soviet Union, from 13.4 to 129.6. The effect was most strongly pronounced at western stations, and the dates of the maxima showed a trend consistent with motion of the source from west to east. A solar flare of 2N importance preceded the period of anomalous absorption and may be connected with it. The likelihood that the electron density increase during the anomalous winter period is connected with increased NO density and with decreased H2O density is discussed. It is concluded that the position and the intensity of circumpolar vortex together with the changing intensity of particle precipitation in the auroral zone are causes of both the regular and the excessive winter absorption at middle latitudes.

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