Marinus van der Sluijs has an article in Nexus magazine on geomagnetic excursions and reversals. Go to https://nexusmagazine.com/product/when-the-aurora-went-global/?v-3e8d115… … the same subject was covered in C & C Review [SIS] 2021:3. Trial pdf version via email is available to interested people.
Geomagnetic excursions and reversals
15 February 2022Electromagnetism