SOME F2 LAYER DIFFUSION PROBLEMS INCLUDING A POSSIBLE EXPLANATION OF THE APPLETON ANOMALY.
SHEFFIELD UNIV (UNITED KINGDOM) DEPT OF APPLIED MATHEMATICS
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The effect of large scale neutral air motions in the F2 layer is studied theoretically for special models by numerical methods and by approximate methods. The results show that generally neutral air transport towards the equator enhances the electron density at the peak, in agreement with theoretical results obtained at moderate latitudes. The work is also of interest in connexion with the theories of ion drag and of electrodynamic lifting of the F2 layer. It is suggested that electrodynamic drifts at right angles to the magnetic field lines in the F2 layer may be replaced by equivalent drifts along the field lines. A possible explanation of the Appleton anomaly is suggested. Dougherty has shown that if the neutral air in the F2 layer is free to move horizontally, the usual diffusion equation for ions becomes greatly altered. The global consequences of this are examined for the noon-day distribution of electrons in equilibrium under the influence of production, diffusion and loss. It appears that the ion-drag mechanism could account for the observed depth of the equatorial trough, but not the latitudinal width of the trough. It is suggested that electrodynamic drift would act in such a way that the trough calculated here would be widened. Author