Figure 2


Download original image

Comparison between sunspot records (crosses: yearly mean total sunspot number V2.0;; Clette & Lefèvre, 2016) and 3-year moving average of our 14C data (dots). The period includes three solar cycles, i.e., cycle 9 (1843/07~; cycle length: 12.5 years), cycle 10 (1855/12~; cycle length: 11.2 years), and cycle 11 (1867/03 CE~; cycle length: 11.7 years), according to Table 2 of Hathaway (2015).

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.