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Daily bulletin on solar and geomagnetic activity from the SIDC

Emesso: 2025 Aug 04 1231 UTC

SIDC Forecast

Brillamenti solari

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

Geomagnetism

Quiet (A<20 and K<4)

Protoni solari

Quiet

	10cm flux	Ap
04 Aug 2025	148	008
05 Aug 2025	150	010
06 Aug 2025	152	010

Solar Active Regions and flaring

Solar flaring activity over the last 24 hours has been moderate, with three M-class flares and multiple C-class flares. The strongest flare was an M2.9 flare (SIDC Flare 5021) peaking at 13:57 UTC on August 03, associated with SIDC Sunspot Group 588 (NOAA Active Region 4168, magnetic type beta-gamma-delta). There are currently eight numbered active regions on the solar disk. The most complex one is Sunspot Group 588 (NOAA Active Region 4168). SIDC Sunspot Groups 539, 572 and 587 (NOAA Active Regions 4157, 4155 and 4166) are currently rotating behind the west limb. SIDC Sunspot Group 554 (magnetic type alpha) has rotated on disc from the east limb, in the northeast quadrant. SIDC Sunspot Group 589 (magnetic type beta) has emerged in the northwest quadrant. The solar flaring activity is expected to be moderate to high over the next 24 hours, with M-class flares very likely and a small chance for X-class flares.

Espulsioni di massa coronale

No Earth-directed Coronal Mass Ejections (CMEs) were observed in the available coronagraph imagery over the last 24 hours.

Vento solare

The solar wind conditions (ACE) were enhanced during the last 24 hours, under the waning influence of the high-speed stream from the equatorial, negative polarity coronal hole (SIDC Coronal Hole 122). The solar wind speed ranged between 430 km/s and 550 km/s. The interplanetary magnetic field was around 8 nT. The Bz component varied between -9 nT and 6 nT. The interplanetary magnetic field angle phi was in the negative sector. A gradual decrease to slow solar wind conditions is expected over the next 24 hours.

Geomagnetism

Geomagnetic conditions globally reached active levels (NOAA Kp 4) between 18:00 UTC and 21:00 UTC on August 04. Geomagnetic conditions locally reached active levels (K Bel 4) between 19:00 UTC and 21:00 UTC on August 04. Mostly quiet conditions, with possible isolated unsettled intervals, (NOAA Kp 1-3) are expected over the next 24 hours.

Proton flux levels

The greater than 10 MeV proton flux was below the 10 pfu threshold over the past 24 hours. It is expected to remain below the threshold level over the next 24 hours.

Electron fluxes at geostationary orbit

The greater than 2 MeV electron flux measured by GOES 18 was over the 1000 pfu threshold between 19:20 UTC and 20:30 UTC on August 03. The greater than 2 MeV electron flux measured by GOES 19 remained below the 1000 pfu threshold during the last 24 hours. The greater than 2 MeV electron flux is expected to remain mostly below the 1000 pfu threshold over the next 24 hours. The 24-hour electron fluence is presently at normal levels and is expected to remain so over the next 24 hours.

Today's estimated international sunspot number (ISN): 109, based on 19 stations.

Solar indices for 03 Aug 2025

Wolf number Catania	///
10cm solar flux	146
AK Chambon La Forêt	015
AK Wingst	014
Estimated Ap	012
Estimated international sunspot number	133 - Based on 30 stations

Noticeable events summary

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

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