5. Latitudinal Dependence
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Figure 10
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[25] With the
r(foF2) max dependence on solar and geomagnetic
activity, looking for the possible latitudinal dependence of
r(foF2) max
one
should compare different stations in the same solar and geomagnetic
conditions. We took 12 stations for 1980 located at different
geomagnetic latitudes between
30o and
60o shown in Figure 10. We took
also auroral Sodankylä (64o) and Kiruna (65o)
stations (not shown in
Figure 10). One can see from Figure 9b that these stations provide
r(foF2) for
Ap < 6 about 0.4-0.6 and that disagrees completely with the
plot in Figure 10. This is due to the fact that the formation of the
F2 region within the auroral oval is governed by different processes as
compared to middle latitudes. We will consider this question later
discussing the possible mechanisms of the
r(foF2) effect.
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