Free Access
Fig. 2

Three-year means of amplitude of the first (A27) harmonic of GCR for the last five solar minima with linear trend (upper panels) and detrended (lower panels) for the Oulu (left panels) and Apatity (right panels) neutron monitor count rates.
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.