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Ann. Geophysicae 18, 945±956 �2000) Ó EGS ± Springer-Verlag 2000 Annual and semiannual variations in the ionospheric F2-layer: II. Physical discussion

By H. Rishbeth, I. C. F. Muè Ller-wodarg, L. Zou, T. J. Fuller-rowell, G. H. Millward, R. J. Mo€ett, D. W. Idenden and A. D. Aylward

Abstract

Abstract. The companion paper by Zou et al. shows that the annual and semiannual variations in the peak F2-layer electron density �NmF2) at midlatitudes can be reproduced by a coupled thermosphere-ionosphere computational model �CTIP), without recourse to external in¯uences such as the solar wind, or waves and tides originating in the lower atmosphere. The present work discusses the physics in greater detail. It shows that noon NmF2 is closely related to the ambient atomic/molecular concentration ratio, and suggests that the variations of NmF2 with geographic and magnetic longitude are largely due to the geometry of the auroral ovals. It also concludes that electric ®elds play no important part in the dynamics of the midlatitude thermosphere. Our modelling leads to the followin

Year: 2013
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