Open Access

Fig. 12


Download original image

Time-of-day (UT)/time-of-year (F) plots of: (left-hand column) the sensitivity of the am index, Sam, for 1988 (the mid-point of the interval 1959–2017 for which am data are available); (middle column) observed 〈ap〉/〈am〉 and (right column) Sap = (〈ap〉/〈am〉)Sam. Data are for 1959–2017 (inclusive) and the am ranges defined in Figure 6.

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.