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ESA: South Atlantic magnetic weak spot grows by nearly half of Europe since 2014

Lane: ecdoSouth Atlantic Anomaly intensity minimum, northeastern Argentina

ESA reports that its three identical Swarm satellites, measuring the field from core to magnetosphere for 11 years, show the South Atlantic Anomaly has expanded by an area nearly half the size of continental Europe since 2014. The anomaly expanded steadily from 2014 to 2025; a region of the Atlantic southwest of Africa weakened faster since 2020. IGRF-14, as published by Beggan et al. in Earth, Planets and Space (2026), places the surface total-field minimum at 22,071 nT at 26.22°S, 60.03°W (northeastern Argentina) at epoch 2025.0. That is a magnetic weak spot, not a pole reversal, and not proof of ECDO.

Official IGRF-14 epoch 2025.0 surface total-field minimum (26.22°S, 60.03°W). Magnetic weak spot, not a pole reversal.
Swarm span
11 years; SAA expanded by area nearly half continental Europe since 2014
Trend named by ESA
expanded steadily 2014–2025; Atlantic SW of Africa weakened faster since 2020
Finlay / DTU (via ESA)
SAA is not a single block; reverse-flux patches at the core–mantle boundary implicated
Canadian strong-field region
shrank 0.65% of Earth’s surface (almost the size of India)
Siberian strong-field region
grew 0.42% (comparable to Greenland)
IGRF-14 min (Beggan et al.)
22,071 nT at 26.22°S, 60.03°W, epoch 2025.0; deepened ~150 nT last five years; drifted west ~20 km/year
ESA page clock
ESA page had no clock; published set to 2026-08-31T16:00:00Z

The SAA is not a single block; change toward Africa differs from change near South America.

Chris Finlay, DTU, as quoted by ESA on the Swarm page

Pin is the IGRF-14 intensity minimum in rural northeastern Argentina (official model coordinates), not a collapse site and not a pole.

ESA published no Swarm IOTD clock time used here; published is a placeholder date because the ESA story page as opened did not carry an Image-of-the-Day clock. Site updater should replace published if ESA’s page timestamp is scraped.

Why it matters

A growing South Atlantic Anomaly is a measured geomagnetic feature. It is not a geomagnetic reversal and not evidence that ECDO is proven science. Do not cite ScienceDaily. Do not treat a PEPI PDF as opened.

Sources

Official data. Not a forecast. Endtimes badge not used on this note.

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