for scene 70 of the video " Cosmic Climate Change 2 From Big to Gigantc to Joy - part 1" by Rolf Witzsche - Ice Age Ahead not Global
here for a larger image
Indicates that it is now possible to use coronal hole data as a proxy
What we see here on the face of the Sun from this timeframe indicates that it is now possible to use coronal hole data, as the SOHO and SDO satellites provide, as a proxy to measure and track solar weakness events, especially in later times when sunspots no longer occur on the face of the Sun.
The limit of technology is that we can only measure what IS occurring, and not what WILL BE occurring in the future.
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Published by Cygni Communications Ltd.
North Vancouver, BC, Canada - (C) in public domain - producer Rolf A. F.