Type II radio emission detected at 08:22 UTC with estimated velocity of 1323 km/s

A Type II radio emission was detected on August 21, 2025, at 08:22 UTC, with an estimated shock velocity of 1323 km/s. This detection was officially issued by the National Oceanic and Atmospheric Administration (NOAA) Space Weather Prediction Center (SWPC) at 11:23 UTC under Space Weather Message Code ALTTP2, Serial Number 1425.

Type II radio emissions occur in association with eruptions on the Sun and typically indicate that a coronal mass ejection (CME) may be associated with a flare event. Events of this type are monitored due to their potential to impact space-based and ground-based technological systems, depending on the direction and magnitude of any associated CME.

Comparison of radio emission timings with today’s solar events shows that the Type II emission began at 08:22 UTC and corresponds in timing with an event labeled as event 6440, which also started at 08:22 UTC and was classified as “II/2” with a velocity of 1323 km/s. This suggests a likely association with this specific solar event.

Current SWPC forecasts indicate that overall solar activity remains at low levels, with only C-class flares observed. The forecast notes the likelihood of continued low to very low activity, with no Earth-directed CMEs observed in coronagraph imagery. Solar wind conditions remain disturbed under the influence of a negative polarity coronal hole high-speed stream, but only minor geomagnetic storming (G1 level) is considered possible at this time. Overall, the environment is expected to return to quieter conditions after August 22, 2025.