Near-M Solar Flare Erupts from AR4535 as Scientists Watch Dual CMEs for Possible Geomagnetic Effects by Oct. 2

A close-up view of a fiery sun with solar flares and magnetic field lines, alongside a distant Earth in space.
AI generated by Grok

On September 30, 2026, sunspot region AR4535 (also tracked as SIDC Sunspot Group 962) produced a strong C8.6 solar flare that peaked at 02:46 UTC. The region had developed increased magnetic complexity (beta- gamma configuration), which made the near- M- class event notable after a period of relatively quiet solar activity.

Image of the Sun highlighting a coronal hole, with the label indicating its location.
Sun news for October 1, 2026. The yellow arrow points to a large coronal hole near the center of the Earth-facing solar disk. Look closely, and you might see a heart shape! A coronal hole is a region in the sun’s atmosphere, or corona, where the magnetic field opens out into space and lets fast solar wind escape. It appears dark because the escaping plasma leaves it cooler and less dense. Now facing Earth, this hole should send its fast wind our way by October 3, possibly bringing G1 (minor) geomagnetic storms and auroras. The GOES-19 SUVI instrument captured this view in its 195 angstrom wavelength channel at 7:32 UTC on October 1. Image via NOAA.

The flare was associated with a coronal mass ejection (CME). SOHO/LASCO C2 imagery first detected the CME around 03:12 UTC; it had an angular width of roughly 70 degrees and a projected speed of about 450 km/s, along with Type II and Type IV radio emissions. Modeling indicates this CME is mostly westward-directed and is expected to miss Earth or deliver only a weak glancing blow (possibly around October 4 at the earliest).

Separately, a filament eruption on September 28 produced a partial-halo CME that is forecast to deliver a glancing blow to Earth around October 2. NOAA SWPC issued a G1 (minor) geomagnetic storm watch for that date, with possible elevated Kp values (highest forecast three-hour Kp around 4.67 / G1 levels in some windows). High- latitude aurora is the most likely visible effect if conditions align; mid-latitude chances remain limited.

High-resolution image of the Sun captured in 304 Angstroms wavelength, displaying solar flares and surface details.
Sun news for September 29, 2026. This full-disk view shows the sun on the afternoon of September 28, as a long filament to the right of the disk began to erupt. The following views show the solar material released in the eruption billowing out into space. Image via NOAA and NASA/ESA.

Overall solar activity has remained low (mostly C- and B- class flares), with AR4535 and a newer region (AR4544) among the numbered groups on the disk. Forecasters expect continued low activity with a chance of additional C- class flares and a slight chance of M-class events in the coming days. Geomagnetic conditions were quiet through September 30, October 1 under ambient solar wind, with the main potential disturbance tied to the September 28 CME arrival.

The WooGlobe reference (WGA970410) and AI/stock-footage disclosure match typical space-weather video explainers summarizing these events. For real- time updates, check sources such as NOAA SWPC, SIDC, EarthSky’s daily sun news, or SolarHam.

Image of the Sun taken with NSO/GONG at 677nm, showing active regions AR4535 and AR4544, captured from Learmonth, Australia.
Sun news October 1, 2026. Here’s today’s sun – with the most active regions labeled – as of 5 UTC this morning, as seen from Learmonth Solar Observatory in Australia. Original image, without labels, via NSO/GONG. Data acquired by GONG instruments operated by NISP/ NSO/ AURA/ NSF with contribution from NOAA, and labeling by EarthSky. Armando Caussade posted today’s sun. Why are east and west on the sun reversed?

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