Minor solar radiation storm conditions were registered on March 31, 2025, following an X1.1 solar flare that erupted from the Sun’s east limb on March 28.
S1 – Minor solar radiation storm conditions were observed on March 31, 2025, as a result of a powerful X1.1 solar flare on the east limb of the Sun on March 28.
The S1 threshold was reached at 11:05 UTC, but the storm only briefly touched it before gradually subsiding. However, it’s possible we might still see S1 periods today and through April 2.
Solar radiation storms of this intensity can cause minor impacts on High Frequency (HF) radio in the polar regions. They happen around 50 times per one 11-year solar cycle.
Solar activity was at high levels in 24 hours to 12:30 UTC today, with M1.6 flare from Active Region 4048 at 16:42 on March 30.
Solar wind parameters predominantly reflected waning positive polarity coronal hole high speed stream (CH HSS) effects. A weak glancing blow impact from a March 28 CME was registered at approximately 10:20 UTC today, increasing the total field to 12 nT.
Solar activity is expected to remain enhanced with a 60% chance of M-class and a 15% chance of X-class solar flares through April 2, primarily due to AR 4048.
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