Free Access
Fig. 1.

Super-synoptic map of the KP and SOLIS photospheric magnetic field observations from January 1978 (CR 1664) to December 2016 (CR 2184). Yellow and blue colors correspond to positive and negative polarity. White vertical lines are periods with no observations.
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.