Viewing archive of Sunday, 7 September 2025

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2025 Sep 07 1231 UTC

SIDC Forecast

Solar flares

M-class flares expected (probability >=50%)

Geomagnetism

Active conditions expected (A>=20 or K=4)

Solar protons

Quiet

	10cm flux	Ap
07 Sep 2025	144	013
08 Sep 2025	142	008
09 Sep 2025	140	007

Solar Active Regions and flaring

Solar flaring activity was moderate over the past 24 hours, with 1 M-class flare identified. The largest flare was a M1.2 flare (SIDC Flare 5442) peaking on September 06 at 22:15 UTC, which was produced by SIDC Sunspot Group 624 (NOAA Active Region 4207). A total of 9 numbered sunspot groups were identified on the disk over the past 24 hours. SIDC Sunspot Group 624 (NOAA Active Region 4207) is the largest and most magnetically complex (Beta-Gamma) region on disk and produced most of the flaring activity in the last 24 hours. Solar flaring activity is expected to be moderate over the next 24 hours, with M-class flares likely and a small chance for X-class flares.

Coronal mass ejections

No Earth-directed Coronal Mass Ejections (CMEs) have been detected in the available coronagraph images.

Solar wind

Over the past 24 hours the solar wind conditions at Earth were disturbed, due to the arrival of a coronal mass ejection (CME) associated with a faint halo CME observed in SOHO/LASCO-C3 images on September 04, and the ongoing influence of a high-speed stream (HHS) associated with SIDC Coronal Hole 123. On September 06 at 13:50 UTC the solar wind speed jumped from 501 km/s to 620 km/s and the total interplanetary magnetic field jumped from 10 nT to 22 nT. Over the entire period the Bz reached a minimum of -10 nT. At the end of the period the solar wind speed is around 520 km/s and the total interplanetary magnetic field is around 9 nT. The phi-angle was mainly in the positive sector (directed away from the Sun), with periods in the negative sector. The solar wind conditions are expected to remain enhanced in the next 24 hours, due to the waning influence of the ICME and the high-speed stream.

Geomagnetism

The geomagnetic conditions over the past 24 hours reached minor storm conditions globally and locally (Kp 5 & K BEL 5). Active conditions are expected for the next 24 hours.

Proton flux levels

Over the past 24 hours, the greater than 10 MeV GOES proton was at background levels and is expected to remain so over the next days.

Electron fluxes at geostationary orbit

The greater than 2 MeV electron flux, as measured by the GOES-18 and GOES-19 satellites, were below the 1000 pfu threshold in the last 24 hours. The 2 MeV electron flux is expected to cross the threshold during the next 24 hour. The 24-hour electron fluence was at normal levels and is expected to remain at normal levels over the next 24 hours.

Today's estimated international sunspot number (ISN): 089, based on 11 stations.

Solar indices for 06 Sep 2025

Wolf number Catania	///
10cm solar flux	146
AK Chambon La Forêt	028
AK Wingst	024
Estimated Ap	026
Estimated international sunspot number	116 - Based on 16 stations

Noticeable events summary

Provided by the Solar Influences Data analysis Center© - SIDC - Processed by SpaceWeatherLive

All times in UTC

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