I'm finding out more about the ionosphere with respect to ham radio high frequency skip communications this week. Thankfully, I've finally found an easy to read ionosonde data site for California. Just as thankfully, I've found a few sites with information on how to read ionosondes and what the propagation processes involved are.
The Point Arguello ionosonde is situated in southern California. It produces ionograms like this one every seven minutes or so
There's an excellent site with more information on how to read the data
And a pdf document from the Australian Government office of Radio and Space Services about how skip communications work.
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