Dynamical roles of planetary waves on the winter anomaly in the middle and lower latitudes

Details Dynamical roles of planetary waves on the winter anomaly in the middle and lower latitudes Dynamical roles of planetary waves on the winter anomaly in the middle and lower latitudes

Dec 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985icsu...18v....k&link_type=abstract

In International Council of Scientific Unions Handbook for MAP, Vol. 18 6 p (SEE N86-27719 18-46)

Physics

Atmospheric Composition, Atmospheric Temperature, Electromagnetic Absorption, Middle Atmosphere, Planetary Waves, Radio Waves, Atmospheric Density, Atmospheric Heating, D Region, Electron Density (Concentration), Geomagnetic Hollow, Geopotential Height, Meridional Flow, Stratospheric Warming, Winter

Scientific paper

The winter anomaly of radio wave absorption in the ionospheric D region (65 to 90 km), caused by a factor of about ten increase in electron density, has been considered to be due to a factor of about ten increase of the nitric oxide concentration and/or a few tens of degrees Kelvin temperature rise due to a strong temperature dependency of the conversion rate of molecular ions to cluster ions. In order to investigate the mechanism of the winter anomaly, the processes that brought about these changes are identified. It is well known that stratospheric warmings sometimes accompany the winter anomaly in middle latitudes. The present study concentrates on the winter anomaly which occurred simultaneously during a sudden warming of the 1967 to 1968 winter, from middle December 1967 to middle January 1968. Variations of geophysical and ionospheric parameters are shown.

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