Glancing blow CME possible on July 23, G1 Geomagnetic Storm Watch
A glancing blow CME from the July 20 eruption could bring a chance for G1 – Minor geomagnetic storm condition on July 23, 2021. As a result, a G1 Geomagnetic Storm Watch is in effect.
A ~4-degree solar filament centered at approximately N25E65 erupted from the visible disk from 16:00 to 16:30 UTC on July 20.
The disappearing solar filament (DSF) was associated with a B5-level enhancement at 16:33 UTC. Coronal mass ejection (CME) signatures were evident in available GOES-16 SUVI imagery.
STEREO-A imagery, as it became available, revealed a partial, northern favoring halo.
However, after further analysis and modeling by SWPC, initial results suggest a possible glancing blow later on July 23.
Space Weather Message Code: WATA20
Serial Number: 897
Issue Time: 2021 Jul 21 2029 UTC
WATCH: Geomagnetic Storm Category G1 Predicted
Highest Storm Level Predicted by Day:
Jul 22: None (Below G1) Jul 23: G1 (Minor) Jul 24: None (Below G1)
THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents – Weak power grid fluctuations can occur.
Spacecraft – Minor impact on satellite operations possible.
Aurora – Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
Featured image credit: NASA SDO/AIA 171
If you value what we do here, create your ad-free account and support our journalism.
Related articles
Producing content you read on this website takes a lot of time, effort, and hard work. If you value what we do here, select the level of your support and register your account.
Your support makes this project fully self-sustainable and keeps us independent and focused on the content we love to create and share.
All our supporters can browse the website without ads, allowing much faster speeds and a clean interface. Your comments will be instantly approved and you’ll have a direct line of communication with us from within your account dashboard. You can suggest new features and apps and you’ll be able to use them before they go live.
You can choose the level of your support.
Stay kind, vigilant and ready!
You can also support us by sending us a one-off payment using PayPal:
