Physics
Scientific paper
Apr 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986jatp...48..365b&link_type=abstract
Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 48, April 1986, p. 365-373. Research supported by the Univ
Physics
26
Annual Variations, Atmospheric Ionization, F 2 Region, Summer, Wind Velocity, Winter
Scientific paper
This paper reports on a comparison of calculated and observed monthly mean day-time ionospheric F2-peak density (NmF2) at a chain of stations from Japan to Australia for both solar minimum (1976) and solar maximum (1980). Nm values are calculated using the MSIS model for the observed peak heights (hmF2) and a simplified version of the continuity equation for day-time equilibrium conditions. The observed NmF2 values are always higher than the calculated ones in winter. This implies that a substantial downward flow of ionization from above into the winter ionosphere is induced by the strongly poleward winter neutral wind which drives the ionization down the field lines, lowering the peak height hmF2. In summer, winds are smaller, and the fluxes are more upward in comparison to winter. The seasonal variation of the ionization fluxes and neutral winds are estimated for solar minimum, and compared with results of detailed calculations.
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