{"id":799066,"date":"2025-11-10T08:34:29","date_gmt":"2025-11-10T13:34:29","guid":{"rendered":"https:\/\/spaceweekly.com\/?p=799066"},"modified":"2025-11-10T08:34:29","modified_gmt":"2025-11-10T13:34:29","slug":"s1-minor-solar-radiation-storm-in-progress-after-x1-2-solar-flare","status":"publish","type":"post","link":"https:\/\/spaceweekly.com\/?p=799066","title":{"rendered":"S1 – Minor Solar Radiation Storm in progress after X1.2 solar flare"},"content":{"rendered":"


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Potential impacts from S1 \u2013 Minor Solar Radiation Storm include minor effects on polar high-frequency (HF) radio communications. Users may experience occasional fades or degradation at lower frequencies, particularly on polar routes. S1 storms occur approximately 50 times per 11-year solar cycle.<\/p>\n

High-energy particles can reach Earth anywhere from ~10 minutes (for a 500 MeV proton) to many hours following the initiating solar event.<\/p>\n

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Image credit: SWPC<\/figcaption><\/figure>\n<\/div>\n
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Image credit: SWPC<\/figcaption><\/figure>\n<\/div>\n

The storm was caused by a major X1.2 solar flare at 09:18 UTC today, accompanied by Type II and Type IV radio emissions that indicated the release of a strong coronal mass ejection (CME). The estimated shock velocity was 1 321 km\/s. Given the region\u2019s current geoeffective position, the CME is expected to have an Earth-directed component.<\/p>\n

\u201cThis event also had a Castelli-U radio burst, which is a good indication a proton event is possible, as well as a halo CME,\u201d SWPC forecasters noted at 12:30 UTC today.<\/p>\n

\u201cThe bulk of the full halo CME, first observed in LASCO C2 imagery at 10\/0936 UTC, appears to have a NW bias, but with the source location being near the center disk, an Earth-directed component is highly likely. Analysis is underway to determine arrival time at Earth.\u201d<\/p>\n