Open Access
Research Article

Fig. 2

image

Download original image

The UT variations of means of the (black lines) am index and its two hemispheric sub-indices an (for the northern hemisphere, red lines) and as (for the southern hemisphere, blue line). The solid lines are for 1959–2017, the dot-dash lines for 1995–2019. The top panel shows the mean absolute values of the index (generically termed ax) in 1-hour bins. The lower panel shows the mean values as a fraction of the overall mean for the interval, ax/〈axall. The hourly values were obtained by linearly interpolating the 3-hour index values.

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.