A Type II Radio Emission, with an estimated velocity of 804 km/s, and a Type IV emission were associated with the event, indicating a strong coronal mass ejection (CME) was produced during the event.
Additionally, a 10cm Radio Burst lasting 25 minutes and with a peak flux of 25 minutes was detected from 07:10 to 07:35 UTC. A 10cm radio burst indicates that the electromagnetic burst associated with a solar flare at the 10cm wavelength was double or greater than the initial 10cm radio background.
This can indicate significant radio noise associated with a solar flare. This noise is generally short-lived but can cause interference for sensitive receivers, including radar, GPS, and satellite communications.
The region is directly facing Earth, making an Earth-directed CME from this event very likely. It has a ‘beta-gamma-delta’ magnetic configuration and is capable of producing more major eruptions on the Sun. Earth-directed CMEs from this region are possible in the days ahead.
Radio frequencies were forecast to be most degraded over the Indian Ocean.
Solar wind parameters in 24 hours to 00:30 UTC on November 9 reflected remnant CME effects and negative polarity coronal hole high speed stream (CH HSS) influences. Total field strength gradually decreased from 11 nT to 5 nT. Bz was sustained southward, by as much as -9 nT, between 0000-08:30 UTC on November 8. Solar wind speeds ranged from 575 to 700 km/s, while Phi was predominantly negative.
Solar wind parameters are expected to remain enhanced through November 11 with negative polarity CH HSS influences (November 9–11) and the anticipated arrival of a CME from November 7 (November 10–11).
The geomagnetic field reached G1 – Minor to G2 – Moderate storm levels due to CME and negative polarity CH HSS influences. Periods of G1 – Minor storming are likely on November 9 in response to negative polarity CH HSS influences.
Periods of G1 – Minor and G2 – Moderate storming are likely on November 10 due to continued negative polarity CH HSS influences and the anticipated arrival of a CME that left the Sun on November 7.
References:
1 Forecast Discussion – NOAA/SWPC – 00:30 UTC on November 9, 2025