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Ancient kauri trees capture last collapse of Earth’s magnetic field By Paul Voosen, Science, February 18, 2021 Ancient Trees Show When The Earth's Magnetic Field Last Flipped Out By Nell Greenfield-Boyce, Short Wave, NPR, February 18, 2021 Buried treasure - subfossil swamp kauri By Kate Evans, New Zealand Geographic Voosen, P., 2021, Kauri trees mark magnetic flip 42,000 years ago Science. vol. 371, Issue 6531, pp. 766 DOI: 10.1126/science.371.6531.766 The paper is: Cooper, A., Turney, C.S.M., Palmer, J. and others, 2021, Global environmental crisis 42,000 years ago Science. Vol. 371, Issue 6531, pp. 811-818 Related paper Staff, R.A., Hardiman, M., Ramsey, C.B., Adolphi, F., Hare, V.J., Koutsodendris, A. and Pross, J., 2019. Reconciling the Greenland ice-core and radiocarbon timescales through the Laschamp geomagnetic excursion. Earth and Planetary Science Letters, 520, pp.1-9. Yours, Paul H.

Earth's magnetic north pole is moving too fast for experts to keep up. Now scientists might know why. Aylin Woodward, Apr. 22, 2019 https://www.businessinsider.com/why-earths-magnetic-north-is-moving-2019-4 Yours, 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.

Earth’s magnetic field is acting up and geologists don’t know why Erratic motion of north magnetic pole forces experts to update model that aids global navigation, Alexandra Witze, Nature News https://www.nature.com/articles/d41586-019-00007-1 Yours, Paul H.

Earth's magnetic field is not about to reverse and trigger global catastrophe. The Independent https://www.independent.co.uk/news/science/earth-magnetic-field-flip-poles-why-not-facts-weak-a8329921.html Earth's magnetic field is not about to reverse, study finds Phys_Org, April 30, 2018 https://phys.org/news/2018-04-earth-magnetic-field-reverse.html The paper is: Maxwell Brown, Monika Korte, Richard Holme, Ingo Wardinski and Sydney Gunnarson, 2018, Earth’s magnetic field is probably not reversing. Proceedings of the National Academy of Sciences April 30, 2018. 201722110; published ahead of print April 30, 2018. https://doi.org/10.1073/pnas.1722110115 http://www.pnas.org/content/early/2018/04/24/1722110115 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.