Type II radio emission detected at 02:52 UTC with estimated velocity of 523 km/s

A Type II radio emission was detected on September 30, 2026, beginning at 02:52 UTC, with an estimated shock velocity of 523 km/s. This event was officially observed by the PAL instrument, as noted in the NOAA SWPC alert.

Type II radio emissions are signatures of shock waves moving through the solar corona, often associated with energetic solar phenomena such as coronal mass ejections (CMEs) or solar flares. However, during the latest reporting period, NOAA SWPC stated that no Earth-directed CMEs were observed. The significance of this event is in its identification of a shock signal in the solar atmosphere, as recorded by ground-based observatories, with the estimated velocity providing insight into the potential strength and dynamics of the disturbance.

A review of solar events around the time of the radio burst shows that Active Region 4535 produced a B-class flare starting at 02:51 UTC and peaking shortly after. The radio emission began at 02:52 UTC and is associated in time and solar location (N11W45) with this flare from Region 4535, suggesting a possible connection between the flare and the detected radio burst.

Overall, solar activity remained at low levels according to the latest NOAA SWPC forecast discussion. Active Region 4535 was the most complex active region on the Sun but did not produce significant activity aside from the noted B-class flare. Solar wind parameters remained ambient, and geomagnetic conditions were quiet. The outlook calls for continued low activity with a slight chance for an isolated M-class flare and quiet geomagnetic conditions expected over the next few days. Enhanced solar wind and potential geomagnetic activity are predicted for October 2 due to a CME that left the Sun on September 28.