Open Access

Fig. 2


Download original image

In panel (a) is reported the yearly average value of the solar flux F10.7, for the considered years of minimum of cycles 21, 22 and 23. Panel (b) shows yearly average value of a p index, for the same years.

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.