for scene 21 of the video " Grand Solar Minimum - Amazing Sun Literacy - part 2" by Rolf Witzsche - Ice Age Ahead not Global
here for a larger image
Cycles 21 and 22, gave us a yardstick
The modern technology that we now have, enables us to measure events that we couldn't have seen prior to the 1970s. Fortunately, the early measurements that we now have available, especially those for cycles 21 and 22, gave us a yardstick with which to measure the dramatic weakening that has begun with cycle 23, and has increased in cycle 24, and is continuing to increase.
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Published by Cygni Communications Ltd.
North Vancouver, BC, Canada - (C) in public domain - producer Rolf A. F.