18 posted 2 years ago by Zap_Powerz 2 years ago by Zap_Powerz +19 / -1 29 comments share 29 comments share save hide report block hide replies
Check "online magnetometer data" search request. There are a lot of magnetometers all over the Earth and their data openly published. You could download data for a decade, f.e. and check your theory.
Sample site: https://supermag.jhuapl.edu/line/