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Do terrestrial geomagnetic field reversals have an effect on Earth's climate? Cooper et al. created a precisely dated radiocarbon record around the time of the Laschamps geomagnetic reversal about 41,000 years ago from the rings of New Zealand swamp kauri trees. This record reveals a substantial increase in the carbon-14 content of the atmosphere culminating during the period of weakening magnetic field strength preceding the polarity switch. The authors modeled the consequences of this event and concluded that the geomagnetic field minimum caused substantial changes in atmospheric ozone conce...

Share But according to the team's findings, the most dramatic part was the lead-up to the reversal, when the poles were migrating across the Earth. 'Earth's magnetic field dropped to only 0 to 6 per cent strength during the Adams Event,' said Professor Turney. 'We essentially had no magnetic field at all – our cosmic radiation shield was totally gone.'  During the magnetic field breakdown, the Sun experienced several grand solar minima (GSM) – long-term periods of quiet solar activity. Even though a GSM means less activity on the Sun's surface, the weakening of its magnetic field can mea...

Charlotte Edwards, Digital Technology and Science Reporter Feb 19 2021, 7:25 ET Updated: Feb 19 2021, 12:45 ET Charlotte Edwards, Digital Technology and Science Reporter Invalid Date, A DISASTROUS collapse of the Earth’s magnetic field wiped out the Neanderthals and could happen again, according to a new study. Researchers say the event left Earth exposed to burning cosmic radiation and, unfortunately, think we're overdue a repeat. 5 The Earth is protected from cosmic radiation by a magnetic field that stems from its magnetic polesCredit: Getty Images - Getty Earth's magnetic field shield...

 E-Mail IMAGE: Using an ancient kauri tree log from Ngāwhā, New Zealand, scientists have dated the timing and environmental impacts of the last magnetic pole switch. view more  Credit: Nelson Parker (www.nelsonskaihukauri.co.nz) The temporary breakdown of Earth's magnetic field 42,000 years ago sparked major climate shifts that led to global environmental change and mass extinctions, a new international study co-led by UNSW Sydney and the South Australian Museum shows. This dramatic turning point in Earth's history - laced with electrical storms, widespread auroras, and cosmic rad...

Earth's last magnetic flip 42,000 years brought environmental change and extinctions. Could that happen now?