A 2025 analysis of Swarm satellite measurements covering 2014–2025 found that the South Atlantic Anomaly expanded by about two million square miles (nearly half the size of continental Europe).
January 01, 2025
high
temporal
Quantitative finding from a multi‑year satellite study of changes in Earth's magnetic field.
A 2025 analysis of Swarm satellite data from 2014–2025 reported that different strong-field regions changed in opposite ways: the strong magnetic region near Canada shrank by an area approximately the size of India, while the strong magnetic region over Siberia grew by an area approximately the size of Greenland; the analysis also found the rate of weakening of the South Atlantic Anomaly increased since 2020 with spatially variable change rates.
January 01, 2025
high
temporal
Spatial and temporal changes in multiple regional magnetic field anomalies identified in a multi‑year satellite dataset.