US EditionThe Biggest Forbush Decrease in 20 Years
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The Biggest Forbush Decrease in 20 Years
June 4, 2025 (Spaceweather.com) — Solar storms are supposed to make radiation go up, right? A severe solar storm on June 1st did just the opposite. The Oulu Cosmic Ray Station in Finland registered the biggest drop in cosmic radiation in more than 20 years: This is called a “Forbush Decrease,” named after American physicist Scott Forbush who studied cosmic rays in the early 20th century. It happens when a coronal mass ejection (CME) sweeps past…
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