{"id":798069,"date":"2025-09-06T03:41:30","date_gmt":"2025-09-06T08:41:30","guid":{"rendered":"https:\/\/spaceweekly.com\/?p=798069"},"modified":"2025-09-06T03:41:30","modified_gmt":"2025-09-06T08:41:30","slug":"cme-impact-and-high-speed-stream-forecast-to-enhance-geomagnetic-activity-through-september-8","status":"publish","type":"post","link":"https:\/\/spaceweekly.com\/?p=798069","title":{"rendered":"CME impact and high-speed stream forecast to enhance geomagnetic activity through September 8"},"content":{"rendered":"


\n<\/p>\n

\n

A large filament eruption was observed at 19:45 UTC on September 4, 2025, followed by at least three CMEs. Model runs suggest a likely arrival early on September 7. In addition, a recurrent positive polarity coronal hole high-speed stream (CH HSS) activity is expected to enhance solar wind parameters beginning early September 6, with G1 \u2013 Minor to G2 \u2013 Moderate geomagnetic storm conditions likely through September 8.<\/strong><\/p>\n<\/div>\n

\n

An approximate 7 degree filament eruption centered near N12W04 was observed at 19:45 UTC on September 4, as detected in GONG H-alpha imagery. This eruption was followed by the appearance of multiple coronal mass ejections (CMEs), as seen in coronagraph data from CCOR and LASCO.<\/p>\n

The first CME, narrow and directed toward the south-southwest, appeared in CCOR imagery around 18:30 UTC on September 4. A second CME, a faint full halo, was observed around 20:15 UTC the same day. Later, LASCO C2 recorded a third CME directed toward the north-northwest at 01:36 UTC on September 5.<\/p>\n

Multiple ensemble model outputs suggest a likely arrival early on September 7.<\/p>\n

\n
HUXt CME impact forecast for September 7, 2025. Credit: University of Reading<\/figcaption><\/figure>\n<\/div>\n