The leading edge of the March 6 coronal mass ejection (CME), reached NASA’s Advanced Composition Explorer (ACE) satellite at 5:42 AM ET. ACE sits just outside of Earth’s magnetic environment, the magnetosphere. As magnetic fields from the CMEs connected up to the magnetosphere, instruments on Earth began to measure changes in our planet’s magnetic fields – indicating the onset of a geomagnetic storm. At the time of writing this was still a minor storm, rated a G1 on a scale of G1 to G5. There will be updates as needed if the rating increases.
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