Open Access
Research Article

Figure 1.

image

Download original image

(a) The Wolf (WSN) and Hoyt & Schatten (1998a, 1998b) Group (GSN) sunspot number time series, for their 1700–1995 period of overlap. Cycle numbers are given at the bottom of the plot. (b) The two groupings of new sunspot number time series: (1) SN* (Clette & Lefèvre 2016) and RGS (Svalgaard & Schatten 2016); and (2) RWL (Lockwood et al. 2014a, 2014b, 2016b), RGU (Usoskin et al. 2016a), and RWF (Friedli, personal communication, 2016). Cycle numbers are given at the bottom of the plot.

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.