Free Access

Table 1

Solar cycle data.

Solar cycle Min/Max Date SSNa

23 Min 1996-May-15 8.0
23 Max 2000-Apr-15 120.8
24 Min 2008-Dec-1 1.7
24 Max 2014-Apr-15 81.9
24 End of obs. 2015-June-30 ...

Notes.

(a)

Smoothed monthly sunspot number from the NOAA international sunspot number listing.

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.