A partial, asymmetric halo coronal mass ejection (CME) was produced by C1.6 solar flare from Region 2871 at 06:34 UTC on September 28, 2021. Another, relatively weak CME was produced by the same region at 12:00 UTC on September 27, with glancing influence possible.
The event was associated with a Type II Radio Emission at 06:20 UTC with an estimated speed of 534 km/s. Type II emissions occur in association with eruptions on the Sun and typically indicate a CME is associated with a flare event.
"The partial, asymmetric halo CME produced by Region 2871 early on the 28th was modeled with a speed of 811 km/s and is expected to overtake the September 27 CME, arriving late on September 30 or early on October 1," SWPC forecasters said at 12:30 UTC on September 29.
The best chance for enhancements are early on October 1.
Quiet geomagnetic field conditions are anticipated for most of September 30 until the arrival of the September 28 CME when conditions are expected to rise to active levels.
G1 - Minor geomagnetic storming is likely, with a slight chance of G2 - Moderate storming, early to mid-October 1 when CME effects are at their greatest.
Featured image credit: NASA/ESA SOHO LASCO C3
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