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Geologists discover rocks with the oldest evidence yet of Earth’s magnetic field. The 3.7 billion-year-old rocks may extend the magnetic field’s age by 200 million years. Jennifer Chu | MIT News, April 24, 2024 Ancient Rocks Reveal Earth's Magnetic Field Existed 3.7 Billion Years Ago, Science Alert, April 27, 2024 The open access paper is: Nichols, C.I., Weiss, B.P., Eyster, A., Martin, C.R., Maloof, A.C., Kelly, N.M., Zawaski, M.J., Mojzsis, S.J., Watson, E.B. and Cherniak, D.J., 2024. Possible Eoarchean records of the geomagnetic field preserved in the Isua Supracrustal Belt, southern west Greenland. Journal of Geophysical Research: Solid Earth, 129(4), p.e2023JB027706. Yours, Paul H.

Testing the damage hand magnets used by amateurs do to meteorites Bob Yirka, PhysOrg, March 11, 2023 The paper is: Vervelidou, F., Weiss, B.P. and Lagroix, F., 2022. Hand magnets and the destruction of ancient meteorite magnetism. Journal of Geophysical Research: Planets, p.e2022JE007464. PDF of preprint of Vervelidou et a. (2002) Official abstract of Vervelidou et a. (2002) Yours, Paul H.

Below is an article that discusses the mistakes and errors to avoid when acquiring and interpreting paleomagnetic data. Bilardello, D., 2018-2019, Civilized magnetist’s deadly sins. The IRM Quarterly. vol. 28, no. 4, pp. 1, 12-20. "If we are uncritical we shall always find what we want: we shall look for, and find, confirmations, and we shall look away from, and not see, whatever might be dangerous to our pet theories." Karl R. Popper Institute for Rock Magnetism, University of Minnesota, Minneapolis, MN The IRM Quarterly Yorus, Paul H.

Earth's Magnetic Field Almost Collapsed 565 Million Years Ago Our planet's core probably started solidifying in the late Ediacaran period, which recharged the magnetic field in the nick of time. https://motherboard.vice.com/en_us/article/9kpywp/earths-magnetic-field-collapse-ediacaran-core-solidification https://www.newsweek.com/earth-magnetic-field-collapse-inner-core-solid-geodynamo-solar-wind-1307659 The (paywalled) papers are: Richard K. Bono, John A. Tarduno, Francis Nimmo & Rory D. Cottrell 2019. Young inner core inferred from Ediacaran ultra-low geomagnetic field intensity. Nature Geoscience 12, pages 143–147. https://www.nature.com/articles/s41561-018-0288-0 Peter Driscoll, Geodynamo recharged Nature Geoscience 12, pages 83–84 https://www.nature.com/articles/s41561-019-0301-2 It is strange how so many odd things occurred during the Ediacaran period. One question is how did this along with everything else did or did not affect evolution of plants and animals? Yours, Paul H.

An Electro-Blob Under Africa May Be 'Ground Zero' for Earth's Magnetic Field Reversal By Stephanie Pappas, Live Science, March 7, 2018 https://www.livescience.com/61958-africa-blob-earth-magnetic-flip.html The open access publication is: Hare, V.J., Tarduno, J.A., Huffman, T., Watkeys, M., Thebe, P.C., Manyanga, M., Bono, R.K. and Cottrell, R.D., 2018. New Archeomagnetic Directional Records From Iron Age Southern Africa (ca. 425–1550 CE) and Implications for the South Atlantic Anomaly. Geophysical Research Letters. http://onlinelibrary.wiley.com/doi/10.1002/2017GL076007/full https://www.researchgate.net/publication/322657982_New_Archeomagnetic_Directional_Records_From_Iron_Age_Southern_Africa_ca_425-1550_CE_and_Implications_for_the_South_Atlantic_Anomaly https://www.researchgate.net/profile/Vincent_Hare The poster is: Hare, V., Genevey, A. and Gallet, Y., 2015, December. New constraints on historical dipole field decay: Four centuries of archaeointensity from Cape Town, South Africa. Poster. AGU Fall Meeting Abstracts. https://www.researchgate.net/publication/297508242_New_constraints_on_historical_dipole_field_decay_Four_centuries_of_archaeointensity_from_Cape_Town_South_Africa https://www.researchgate.net/profile/Vincent_Hare Yours, Paul H.