Viendo archivo del miércoles, 30 julio 2025

Daily bulletin on solar and geomagnetic activity from the SIDC

Emitido: 2025 Jul 30 1231 UTC

SIDC Forecast

Llamarada solar

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

Geomagnetism

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

Protones solares

Quiet

	10cm flux	Ap
30 Jul 2025	154	016
31 Jul 2025	156	018
01 Aug 2025	158	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 11 numbered sunspot groups were identified on the visible solar disk. The most notable activity was a C3.7 flare (SIDC Flare 4962) with peak time 22:05 UTC on July 29, produced by a region behind the north-west limb. SIDC Sunspot Group 572 (NOAA Active Region 4155) classified as magnetic type beta has exhibited some growth and was responsible for most of the on-disc flaring activity over the past 24 hours with some contributions from SIDC Sunspot Group 539 (NOAA Active Region 4157). The remaining active regions on the visible solar disc have been mostly quiet. The solar flaring activity is expected to increase to moderate levels over the next 24 hours with likely M-class flaring.

Eyección de masa coronal

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

Viento solar

Over the past hours the solar wind parameters as measured by ACE have registered some enhancements, possibly indicating the expected connection to a high-speed stream from a negative polarity coronal hole. The magnitude of the interplanetary magnetic field (B) reached 12.8 nT with a minimum Bz of -5.2 nT. The solar wind speed reached 500 km/s. The B field phi angle was entirely in the negative sector (directed towards the Sun). Enhanced solar wind conditions are expected to continue over the next two days.

Geomagnetism

The geomagnetic conditions over the past 24 hours were quiet to unsettled. Quiet to active geomagnetic conditions are expected for the next 48 hours with possible isolated minor storms intervals related to the expected influence 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 2 MeV electron flux as measured by GOES 18 has briefly exceeded the 1000 pfu threshold over the last 24 hours, while the greater than 2 MeV electron flux as measured by GOES 19 remained below the 1000 pfu threshold. The greater than 2 MeV electron flux is expected to be predominantly below the 1000 pfu threshold in the next 24 hours, though it might increase again over the next days with the expected high speed stream arrival. The 24-hour electron fluence was at nominal levels and is expected to remain so in the next 24 hours.

Today's estimated international sunspot number (ISN): 148, based on 23 stations.

Solar indices for 29 Jul 2025

Wolf number Catania	///
10cm solar flux	152
AK Chambon La Forêt	010
AK Wingst	008
Estimated Ap	008
Estimated international sunspot number	133 - Based on 26 stations

Noticeable events summary

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

All times in UTC

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