Download original image
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.
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.