Sun news: Series of sun blasts arriving, auroras to come

Sun news September 8: Series of sun-blasts arriving, auroras to come

Today’s top story: A convoy of sun-stuff blasts has started arriving at our planet. We saw at least four coronal mass ejections (CMEs) fired from sunspot region AR4524 toward Earth over the weekend. The first arrived this morning, triggering a G1 (minor) geomagnetic storm. And this is likely just the beginning. As more impacts arrive today and tomorrow, forecasters have called for G2 (moderate) or even G3 (strong) storming. What does that mean for skywatchers? Auroral displays may reach as far south as New York, London, and northern France tonight and, more likely, tomorrow night. And if two or three of these structures combine, auroras could push even farther south! We’ll keep you updated.

Past 24 hours on the sun

(11 UTC September 7 – 11 UTC September 8)

Flare activity: Solar activity continued at low levels. Observers registered just two events over the past 24 hours: one C-class (common) and one B-class (weak) flare.

• Strongest flare: A C1.0 from AR4528 at 19:35 UTC on September 7.
• Lead flare producer: AR4526 and AR4528 tied, with one flare each. However, AR4528’s C1.0 outranked AR4526’s B7.8.

Sunspot regions: Currently, the Earth-facing solar disk displays seven numbered sunspot regions. Most stayed stable and magnetically simple. A newcomer in the northeast quadrant received its number this period: AR4530.

• AR4524 (beta): This region continued to show weak decay. It lost its gamma and now shows a simpler beta configuration. It produced no flares during this period.
• AR4528 (alpha): This region was one of only two flare producers. It sparked the strongest flare of the period, a C1.0.
• AR4521 (alpha), AR4523 (alpha), AR4527 (alpha), and AR4529 (alpha): These regions stayed stable, with no signs of flare production.
• AR4530 (beta): This region emerged from nowhere in the middle of the northeast quadrant. It now shows a beta configuration. It’s stable for now, but it shows early signs of potential.

Blasts from the sun? The 1st of multiple coronal mass ejections (CMEs) arrived this morning and triggered a G1 (minor) geomagnetic storm. Forecasters anticipate additional arrivals through the rest of the day. Confidence in exact timing is low. Still, the combined effect makes G1 to G2 storming likely, with G3 possible if conditions align favorably. Meanwhile, a C2.1 flare at 9:01 UTC on September 7 from AR4524 hurled plasma into space. Initial analysis suggests most of that solar material may pass north of and behind Earth’s orbit. Observers spotted no newer CMEs in available coronagraph imagery.

Past 24 hours in space weather

Solar wind: Solar wind speeds averaged at moderate levels early in the period. Then, starting at 0 UTC this morning, speeds increased to moderate-high levels. The arrival of multiple CMEs from September 5 and 6, plus the onset of a coronal hole high-speed stream, should keep solar wind speeds elevated through September 9.

Bt, Bz and magnetic coupling: The interplanetary magnetic field total strength (Bt) started the period strong. It then slowly eased to weak strength by the time of this writing. Meanwhile, the Bz component fluctuated between south and north, with the stronger peaks pointing southward. That opened the door for the geomagnetic storm. At the time of this writing, a Kp 5 is ongoing, and the Bz points southward.

Earth’s magnetic field: Earth’s magnetic field showed unsettled to active levels throughout the period, with Kp values in the 3 to 5 range. The Kp 5 threshold was reached at 7:30 UTC this morning, provoking a G1 (minor) geomagnetic storm.

What’s ahead? Sun–Earth forecast

Flare activity forecast: Forecasters expect solar activity to ease to low levels, with occasional C-class flares through September 9. Chances for M-class flares dropped to 15% today, compared to 20% yesterday. AR4524 and newcomer AR4530 are the likely sources. AR4528 may also contribute, as it rotates further onto the disk. Meanwhile, an X-class (strong) flare is very unlikely at 1%, given the modest complexity of the visible regions.

Geomagnetic activity forecast:

• September 8: Active conditions, with G1 (minor) storm periods, may continue through the rest of the day. The combined CME arrivals and coronal hole stream could push Kp to 6, driving G2 (moderate) storm conditions. Auroras could then appear over Edinburgh, Seattle, Minneapolis, and potentially Toronto, Chicago, and northern England.
• September 9: This day carries the greatest chance of significant geomagnetic storm activity. That’s when the full effect of multiple CME arrivals, potentially combined into a single enhanced structure, interacts with Earth’s magnetic field. G1 (minor) to G2 (moderate) storming is likely. A slight chance exists for peak G3 (strong) conditions (Kp 7) if the southward Bz cooperates. Under G3 conditions, auroras could appear as far south as New York, London, and northern France. Confidence in timing and magnitude remains low. Even so, the convergence of multiple drivers makes this the day to watch.
• September 10: Anticipate quiet to unsettled conditions as the effects of the multiple CMEs start to wane.

Sun news September 7: Sun-stuff bursts could trigger strong auroras

A convoy of coronal mass ejections (CMEs) is bearing down on our planet, with the first arrivals expected from later today. Solar observers saw at least four CMEs launch from sunspot region AR4524 over September 5 and 6. These are now racing through interplanetary space and could merge into a combined punch. What might that mean for us? Such a combined structure could drive G1 (minor) to G2 (moderate) geomagnetic storms, with a slight chance of G3 (strong) conditions later this week. In turn, that could bring aurora as far south as New York, London and northern France. The peak of auroral activity is currently looking like Wednesday, but stay tuned as the story unfolds!

Past 24 hours on the sun

(11 UTC September 6 – 11 UTC September 7)

Flare activity: Solar activity stayed at low levels. Observers logged 6 flares: 2 C-class (common) and 4 B-class (weak) events.

• Strongest flare: A C5.0 from AR4524 at 10:31 UTC on September 6. Notably, this C-class flare came with a halo CME, first visible in LASCO C2 imagery at 11:12 UTC. That’s an unusually energetic eruption for such a modest flare classification.
• Lead flare producer: AR4524 dominated, firing 4 of the 6 flares during the period: the C5.0 plus three B-class events.
• For context: An M1.0 flare from decayed AR4520 near the west limb erupted on September 5, just before this reporting period. It came with a fast halo CME and triggered an S1 (minor) proton event.

Sunspot regions: The Earth-facing solar disk displayed approximately 6 numbered sunspot regions. Most appeared quiet and magnetically simple.

• AR4524 (beta-gamma): This region continued to show weak decay. Even so, it remained the most active on the disk. Its beta-gamma configuration sustained C-class flare production, and it produced multiple CMEs over the past two days. It warrants continued monitoring as it rotates toward the disk center.
• AR4528 (alpha): This region received its number during the period. Despite its simple magnetic configuration, it produced a C1.1 flare. Located near the east limb, it will rotate into a more Earth-directed position over the coming days.
• AR4520 (near the west limb): This region had decayed, yet it was the source of the significant M1.0 flare and fast halo CME on September 5. It continues rotating toward the far side.
• The remaining active regions on the disk stayed quiet and stable, producing no significant flaring.

Blasts from the sun? The aftermath of multiple CME eruptions from AR4524 over September 5 and 6 dominated the period. In addition, observers detected a fresh halo CME with the C5.0 flare, adding to an already complex queue of Earth-directed plasma clouds. Multiple CMEs from AR4524 should arrive in a potentially combined structure. The earliest could reach Earth late on September 7, around 20:36 to 23:21 UTC. Additional material should follow through September 8, up to around 18:41 UTC. Confidence in exact timing is low. Still, the combined effect makes G1 to G2 storming likely, with G3 possible if conditions align favorably.

Past 24 hours in space weather

Solar wind: Solar wind speeds remained at nominal background levels through most of the period. The arrival of a slow filament CME from September 2 and the onset of a coronal hole high-speed stream should boost solar wind speeds to elevated levels through September 7.

Bt, Bz and magnetic coupling: The interplanetary magnetic field total strength (Bt) was average. However, a coherent magnetic structure began rotating through the near-Earth environment starting around 20:40 UTC on September 6. Bt climbed by the end of the reporting period. Meanwhile, the Bz component fluctuated with no strongly sustained southward orientation. That limited geomagnetic coupling and kept aurora at bay.

Earth’s magnetic field: Earth’s magnetic field stayed quiet throughout the period, with Kp values remaining in the 0 to 2 range. The lack of sustained southward Bz and the slow solar wind regime kept activity subdued, even though the energetic particle environment stayed slightly elevated after the S1 (minor) proton event on September 5.

The sun in recent days

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Bottom line: Sun news September 8, 2026: The 1st blast of sun-stuff arrived, sparking a G1 storm this morning. More are inbound, so G2 to G3 storms and auroras could follow!

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