Type II radio emission detected at 16:45 UTC with estimated velocity of 1681 km/s

A Type II radio emission was detected on July 30, 2026, beginning at 16:45 UTC, with an estimated shock velocity of 1681 km/s. This alert was issued by the NOAA Space Weather Prediction Center at 17:12 UTC on the same day.

Type II radio emissions are typically associated with coronal mass ejections (CMEs) and indicate the presence of a shock wave moving through the solar corona. These events can signal the potential for space weather impacts, including disturbances to satellite operations, radio communications, or navigation signals, particularly if the associated CME is Earth-directed. The NOAA alert did not specify an Earth-directed CME for this event.

No significant solar flares were reported near the time of the Type II radio emission. The largest flare on July 30 was a C3.8 event from Region 4498, which peaked at 06:06 UTC. There were no sizable flares reported in the hours nearing the radio emission at 16:45 UTC, suggesting this event was not directly associated with major flare activity during this period.

According to the latest SWPC Forecast Discussion, overall solar activity was at low levels, with recent filament eruptions and a narrow CME observed but not directed toward Earth. The solar wind environment was calm, with geomagnetic field conditions remaining quiet. Forecasts anticipate a return to more disturbed solar wind late on July 30 due to positive polarity coronal hole high speed stream effects and recent CMEs, but the chances for a geomagnetic storm rated G1 or greater are estimated at 25-30% during the current forecast period.