The space radiation event near Earth peaked yesterday at 22:15 Moscow time, marked by a solar proton density reaching an unprecedented 37,000 particles flux units (pfu).
This represents the highest figure recorded in this century; prior peaks had not exceeded 31,700 units (recorded on November 6, 2001) and 29,500 units (on October 29, 2003).
For context, the preceding storm during the 25th solar cycle in October 2024 had only reached approximately 1,800 pfu. Since record-keeping began in 1976, the largest event remains the one from March 24, 1991, which measured 43,000 units.
Presently, the radiation intensity has receded to around 200 pfu, which is still twenty times the established warning threshold (set at 10 pfu).
It was previously known that the geomagnetic storm, which initiated on Earth following the most powerful solar flare of 2026, attained a G4.7 classification and narrowly missed the top G5 level.
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