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Fig. 5.


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Regions where one may observe the winter anomaly (blue color) in TEC (a−c) and N m F2 (d). (a) K p in the last 24 h did not surpass 3; (b) K p did not surpass 3 in the last 48 h, except recording 3 < K p ≤ 6 at least once in the last 24 h; (c) K p in the last 24 h did not surpass 3, but in the last 48 h it was recorded 3 < K p-1 ≤ 6. For N m F2 (d) there was no K p separation. Bold gray curves are the geomagnetic equator and ±15° geomagnetic latitudes.

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