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Daily bulletin on solar and geomagnetic activity from the SIDC

Emesso: 2025 Jul 29 1231 UTC

SIDC Forecast

Brillamenti solari

C-class flares expected, (probability >=50%)

Geomagnetism

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

Protoni solari

Quiet

	10cm flux	Ap
29 Jul 2025	146	014
30 Jul 2025	148	015
31 Jul 2025	150	015

Solar Active Regions and flaring

Solar flaring activity was at low levels with low C-class flaring over the past 24 hours. A total of 12 numbered sunspot groups were identified on the visible solar disk most of them being small, simple and inactive. The largest flare was a C3.1 flare (SIDC Flare 4960) peaking on July 29 at 05:11 UTC, which was produced by SIDC Sunspot Group 572 (NOAA Active Region 4155). The region has been classified as beta and and has exhibited small growth over past 24 hours. Other low C-class flaring was produced by SIDC Sunspot Group 570 (NOAA Active Region 4153) and a region behind the west limb. Several new and simple active regions have emerged on the visible solar disc, but have been inactive.The solar flaring activity is expected to remain at low levels over the next 24 hours, with very likely C-class flares and a chance for M-class flares.

Espulsioni di massa coronale

No Earth-directed coronal mass ejections (CMEs) have been identified in the available coronagraph imagery.

Vento solare

Over the past 24 hours the solar wind parameters as measured by ACE have reflected nominal background slow solar wind conditions. The magnitude of the interplanetary magnetic field (B) reached 7.7 nT with a minimum Bz of -5.5 nT. The solar wind speed was mostly below 450 km/s with speeds reaching as low as 336 km/s. The B field phi angle remained predominantly in the negative sector (directed towards the Sun). The solar wind conditions are expected to become enhanced under an anticipated influence of a high speed stream over the upcoming days possibly starting from late on July 29.

Geomagnetism

The geomagnetic conditions over the past 24 hours were quiet to unsettled. Quiet to active geomagnetic conditions are expected for the next 24 hours with chances for isolated minor storms intervals related to the expected arrival of a high speed stream arrival.

Proton flux levels

Over the past 24 hours the greater than 10 MeV GOES proton flux has been at nominal levels and is expected to remain at nominal levels over the next days.

Electron fluxes at geostationary orbit

The greater than 10 MeV GOES 18 and GOES 19 electron fluxes have briefly exceeded the 1000 pfu threshold over the last 24 hours and are expected to reach the 1000 pfu threshold again in the next 24 hours. The 24-hour electron fluence was at the border of nominal to moderate levels and is expected to be at nominal levels in the next 24 hours.

Today's estimated international sunspot number (ISN): 138, based on 21 stations.

Solar indices for 28 Jul 2025

Wolf number Catania	169
10cm solar flux	145
AK Chambon La Forêt	014
AK Wingst	008
Estimated Ap	008
Estimated international sunspot number	135 - Based on 20 stations

Noticeable events summary

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

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