Diurnal variations in the flux of ionisation above the F2 peak in the northern and southern hemispheres

Physics

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Atmospheric Ionization, Diurnal Variations, F 2 Region, Midlatitude Atmosphere, Northern Hemisphere, Southern Hemisphere, Equinoxes, Pacific Islands, Solstices, Wind Effects

Scientific paper

The ionization flux at 850 km has been determined based on the MSIS atmospheric model, a form of the continuity equation at the peak of the F2-layer, and observed NmF2 values. At all stations, the daytime flux is found to have a larger downward component in winter than in summer. Zonal winds produce opposite effects on the diurnal variations of hmF2, NmF2, and flux in the northern and southern hemispheres due to the eastward magnetic declination. At the solstices, the daytime flow is shown to be about four times larger in winter than in summer. The total flow at 21 deg latitude averaged over both hemispheres is about the same for solstice and equinox conditions.

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