Download original image
Variations in geomagnetic range indices for 27 October 2003 to 2 November, showing the “Halloween storms”: (a) 3-hourly values am, f × ap, aa and aaH (b) their 24-hour (8-point) running (“boxcar”) means Am*, f × Ap*, Aa* and AaH*. The ap and Ap* values have been multiplied by f = 〈am〉all/〈ap〉all, the ratio of overall means of am and ap for 1995–2017, to allow for the difference between the scaling of ap and that for other indices. Circles, triangles, squares and diamonds are for am (Am*), f × ap (f × Ap*), aa (Aa*), and aaH (AaH*), respectively. Points are colour-coded by the UT of observation in (a) and vertical grey lines are at UT = 0.
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.