Space weather – The Watchers

M2.4 solar flare erupts from the northeast limb

Teo Blašković — Tue, 08 Jul 2025 11:13:38 +0000

After 18 days with no notable flaring, our star unleashed an M2.4 solar flare from an emerging region on the northeast limb. The flare began at 03:42, peaked at 04:17 and ended at 04:37 UTC.

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Impulsive X1.9 solar flare erupts from Region 4114

Teo Blašković — Fri, 20 Jun 2025 07:50:40 +0000

An impulsive solar flare measuring X1.9 erupted from Active Region 4114 at 23:50 UTC on June 19, 2025. The event started at 23:37 and ended at 23:54 UTC.

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Impulsive X1.2 solar flare erupts from geoeffective Active Region 4114

Teo Blašković — Tue, 17 Jun 2025 23:09:23 +0000

An impulsive solar flare measuring X1.2 erupted from Active Region 4114 at 21:49 UTC on June 17, 2025. The event started at 21:38 and ended at 21:54 UTC.

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Strong M8.4 solar flare erupts from AR 4114, CME produced

Teo Blašković — Sun, 15 Jun 2025 19:17:36 +0000

A strong M8.4 solar flare erupted from Active Region 4114 at 18:07 UTC on June 15, 2025. This event began at 17:45 UTC, peaked at 18:07 UTC, and ended at 18:25 UTC.

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CH HSS sparks G2 – Moderate geomagnetic storm

Teo Blašković — Fri, 13 Jun 2025 09:10:25 +0000

Elevated geomagnetic activity was recorded on Earth on June 13, 2025, due to the waning effects of a negative polarity coronal hole high-speed stream and possible transient effects.

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S1 – Minor solar radiation storm in progress following M8.1 solar flare

Teo Blašković — Sat, 31 May 2025 20:28:26 +0000

An S1 - Minor solar radiation storm began at 17:00 UTC on May 31, 2025. The storm is linked to a long-duration M8.1 solar flare from Active Region 4100 at 00:05 UTC on May 31. Minor HF radio signal fades are being reported at high latitudes.

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G4 – Severe geomagnetic storm watch issued for June 2 following strong Earth-directed CME

Teo Blašković — Sat, 31 May 2025 19:51:03 +0000

The U.S. Space Weather Prediction Center (SWPC) issued a G4 - Severe geomagnetic storm watch for June 2, 2025, following the eruption of a powerful, Earth-directed coronal mass ejection (CME) associated with a long-duration M8.1 solar flare from Active Region 4100. The CME is forecast to arrive at Earth late on June 1, with geomagnetic storm conditions expected to intensify through June 2.

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Long-duration M8.1 solar flare produces strong Earth-directed CME, impact expected on June 1

Teo Blašković — Sat, 31 May 2025 09:17:49 +0000

A strong, long-duration solar flare registered as M8.1 erupted from Active Region 4100 at 00:05 UTC on May 31, 2025. The flare began at 23:31 UTC on May 30 and ended at 01:32 UTC on May 31. The eruption produced a significant coronal mass ejection (CME). Model forecasts indicate that the CME is Earth-directed and is expected to arrive on June 1.

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M3.4 solar flare erupts from AR 4100, Earth-directed CMEs possible in coming days

Teo Blašković — Fri, 30 May 2025 07:44:49 +0000

A moderately strong solar flare measuring M3.4 erupted from Active Region 4100 at 06:13 UTC on May 30, 2025. The event started at 05:40 and ended at 06:19 UTC. A coronal mass ejection (CME) may have been produced during the event, and there is a possibility that part of it is directed toward Earth.

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Negative polarity CH HSS triggers G3 – Strong geomagnetic storm

Teo Blašković — Thu, 29 May 2025 09:57:05 +0000

A G3 - Strong geomagnetic storm was observed at 02:16 UTC on May 29, 2025, triggered by the arrival of a negative polarity coronal hole high-speed stream at Earth. Coronal hole high-speed streams, and their associated transition zones called co-rotating interaction regions (CIRs), can create CME-like shock waves that are capable of producing strong geomagnetic disturbances and widespread auroras.

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