G2 – Moderate Geomagnetic Storm Alert issued on September 9

A G2 – Moderate Geomagnetic Storm Alert was issued on September 9, 2025, with activity observed during the synoptic period from 21:00 to 24:00 UTC. The alert was triggered when the geomagnetic K-index reached a value of 6 at 23:16 UTC. This alert remains active, according to the latest information from the NOAA Space Weather Prediction Center.

Potential impacts include effects primarily at geomagnetic latitudes poleward of 55 degrees. Power grid fluctuations can occur, and high-latitude power systems may experience voltage alarms. Satellite operators may see orientation irregularities, and increased atmospheric drag on low Earth-orbiting satellites is possible. High frequency (HF) radio propagation may experience fading at higher latitudes. Conditions are also favorable for auroral displays as far south as New York, Wisconsin, and Washington state.

According to the latest forecast discussion, the geomagnetic storm activity is related to ongoing elevated solar wind conditions caused by a positive polarity coronal hole high speed stream (CH HSS). No Earth-directed coronal mass ejections were observed, and solar activity remains at low levels with only C-class flares reported.