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Bar graph of (a) monthly total PSD events and (b) total number of PSD hours per month for solar cycle 22 and cycle 23. Amounts that are for moderate depression are shown in orange, and the remaining red shades represent severe depression.
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.