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Daily bulletin on solar and geomagnetic activity from the SIDC

Vydáno: 2025 Sep 04 1231 UTC

SIDC Forecast

Sluneční erupce

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

Geomagnetism

Quiet (A<20 and K<4)

Sluneční protony

Quiet

	10cm flux	Ap
04 Sep 2025	178	008
05 Sep 2025	172	022
06 Sep 2025	164	013

Solar Active Regions and flaring

Solar flaring activity was low over the past 24 hours, with only C-class flares identified. The largest flare was a C9.2 flare (SIDC Flare 5423) peaking on September 04 at 05:32 UTC, which was produced by SIDC Sunspot Group 624 (NOAA Active Region 4207). A total of 10 numbered sunspot groups were identified on the disk over the past 24 hours. SIDC Sunspot Group 624 (NOAA Active Region 4207) is the second largest and most magnetic complex region on disk with a Beta-Gamma magnetic configuration. SIDC Sunspot Group 614 (NOAA Active Region 4197) is the largest region on disk, has a Beta magnetic configuration and is about to rotate off the visible disk over the west limb. Solar flaring activity is expected to be moderate over the next 24 hours, with C-class flares expected and M-class flares likely.

Vyhazování koronální hmoty

No Earth-directed Coronal Mass Ejections (CMEs) have been detected in the available coronagraph images. Further analysis of the Coronal Mass Ejection (CME) seen in LASCO-C2 data at 02:24 UTC on September and associated with a filament eruption seen in SDO/AIA 194 and 304 at 01:28 UTC on September 03, show that it is unlikely to impact the Earth.

Koronální díra

SIDC Coronal Hole 123 (equatorial coronal hole with a positive polarity) first reached the central meridian on September 02, its associated high-speed stream is expected to arrive at Earth on September 05. (Other crossing times: August 06) SIDC Coronal Hole 128 (equatorial coronal hole with a positive polarity) first reached the central meridian on September 03, its associated high-speed stream is expected to arrive at Earth on September 06.

Solární bouře

Over the past 24 hours, the solar wind conditions at Earth returned to slow solar wind conditions under the waning influence of an interplanetary coronal mass ejection (ICME) that left the Sun on August 30 at 20:12 UTC. The solar wind speed ranged from 431 km/s to 540 km/s. The total interplanetary magnetic field ranged from 6 nT to 9 nT, with the Bz reaching a minimum of -4 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 become disturbed late on September 05, due to the expected arrival of high-speed stream associated with SIDC Coronal Hole 123.

Geomagnetism

The geomagnetic conditions over the past 24 hours were globally quiet (Kp 1-2) and quiet to unsettled locally (K BEL 1-3). Quiet to unsettled 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 remain below 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): 165, based on 20 stations.

Solar indices for 03 Sep 2025

Wolf number Catania	144
10cm solar flux	180
AK Chambon La Forêt	012
AK Wingst	013
Estimated Ap	011
Estimated international sunspot number	147 - Based on 21 stations

Noticeable events summary

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

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