\u201cThe region of weak magnetic field in the South Atlantic has continued to increase in size over the past 11 years since the launch of the Swarm satellite constellation,\u201d explained Chris Finlay, a geomagnetism researcher at the Danmarks Tekniske Universitet. \u201cAlthough its growth was expected based on early observations, it is important to confirm this change in Earth\u2019s magnetic field is continuing.\u201d <\/p>\n
![\"Image\"](\"https:\/\/www.newsbeep.com\/il\/wp-content\/uploads\/2025\/11\/image-52.png.webp.webp\")
(Image credit: ESA (Data source: Finlay, C.C. et al., 2025))<\/p>\n
Finlay, the lead author of the study, emphasized that the anomaly now covers an area roughly half the size of continental Europe \u2014 a striking indicator of just how dynamic and unpredictable our planet\u2019s magnetic shield can be.<\/p>\n
Beneath this region, at depths of nearly 1,800 miles, molten iron currents circulate in complex patterns that generate the geomagnetic field. <\/p>\n
\u201cIt is related to the circulation patterns of the liquid metal in the core, but we are not certain of the exact cause,\u201d Finlay said. <\/p>\n
The study suggests that shifts in these subterranean flows may be fueling the magnetic imbalance, yet the precise mechanisms remain elusive.<\/p>\n
![\"Image\"](\"https:\/\/www.newsbeep.com\/il\/wp-content\/uploads\/2025\/11\/image-53.png.webp.webp\")
(Image credit: ESA (Data source: Finlay, C.C. et al., 2025))<\/p>\n
Satellites And Spacefarers At Greater Risk<\/p>\n
For satellites and astronauts, this growing weak zone is far from a theoretical problem. \u201cThe main consequence is for our low-Earth-orbit satellite infrastructure,\u201d Finlay said. <\/p>\n
\u201cThese satellites experience higher rates of charged particles when they pass through the weak field region, which can cause problems for the electronics.\u201d<\/p>\n
Spacecraft entering the SAA are bombarded by energetic solar particles that would normally be deflected by a stronger magnetic field. These encounters can cause temporary system glitches, data corruption, and even full-scale blackouts. For crewed missions, the radiation spike raises health concerns. Astronauts aboard the International Space Station, which occasionally passes through this region, face an elevated risk of DNA damage and long-term cancer development.<\/p>\n
Finlay warns that this trend is accelerating: <\/p>\n
\u201cSince the weakness is growing, the satellites will experience such effects over a larger area, [so] this should be taken into account when designing future missions.\u201d <\/p>\n
Engineers are now urged to \u201charden\u201d spacecraft systems to withstand higher radiation doses, anticipating that the SAA could keep spreading in the coming decades.<\/p>\n
Understanding Earth\u2019s Shifting Magnetic Field<\/p>\n
Despite the alarming tone of these findings, scientists do not believe Earth\u2019s magnetic field is about to flip \u2014 a process that has occurred hundreds of times in geological history. Instead, what\u2019s unfolding appears to be a long-term fluctuation linked to the dynamic movement of molten iron inside Earth\u2019s core.<\/p>\n