Open Access

Fig. 13


Download original image

(a) Grey points shows ap index values as a function of simultaneous am values for 1959–2017 (inclusive). Cyan points show the scatter plot of the corresponding 24-hour (8-point) running means, Am* and Ap*. The black points are means of ap (with error bars of plus and minus one standard deviation) as a function of means of am in am bins of width Δam = 10 nT (only means for bins containing six or more samples are shown). The mauve line is the ideal case for which ap = am. (b) and (c) Annual variations shown by means in fraction-of-year (F) bins of width ΔF = 0.05. (b) shows (in black) the annual variations of 〈am〉 and (in mauve) 〈ap〉 × η, where η is the ratio 〈amall/〈apall for means taken over the whole dataset. (c) shows the annual variation of the ratio of ap/am. (d) and (e) Diurnal variations shown by means for the eight UT values of both indices using the same color coding as in (b) and (c).

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.