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Daily bulletin on solar and geomagnetic activity from the SIDC

Emesso: 2026 Apr 25 1234 UTC

SIDC Forecast

Brillamenti solari

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

Geomagnetism

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

Protoni solari

Quiet

	10cm flux	Ap
25 Apr 2026	143	010
26 Apr 2026	138	016
27 Apr 2026	134	013

Solar Active Regions and flaring

Solar flaring activity was high over the past 24 hours, with 3 M-class flares identified. A total of 9 numbered sunspot groups were identified on the disk over the past 24 hours. SIDC Sunspot Group 850 (NOAA Active Region 4423), SIDC Sunspot Group 825 (NOAA Active Region 4419) and SIDC Sunspot Group 847 (NOAA Active Region 4420) are the most magnetically complex regions on disk (Beta-Gamma-Delta) and produced most of the flaring activity. SIDC Sunspot Group has started rotating over the west limb of the visible solar disk. The largest flare was a M6.4 flare (SIDC Flare 7484) peaking on April 24 at 18:15 UTC, which was produced by SIDC Sunspot Group 825. The second-largest flare was M1.7 flare (SIDC Flare 7481) peaking on April 24 at 13:01 UTC and the third- largest flare was a M1.3 flare (SIDC Flare 7491) peaking on April 25 at 07:59 UTC both produced by SIDC Sunspot Group 850. Solar flaring activity is expected to be moderate over the next 24 hours, with M-class flares very likely and a small chance for X-class flares.

Espulsioni di massa coronale

Further analysis of the Coronal Mass Ejection (CME) observed LASCO-C2 data around 08:34 UTC on April 24 shows a possible glancing blow arrival at 23:00 UTC on April 26. A CME was observed LASCO-C2 data at 18:348 UTC on April 24. This CME is associated with a M6.4 flare (SIDC Flare 7484) peaking on April 24 at 18:15 UTC. Analysis of this CMEs is ongoing.

Vento solare

Slow solar wind conditions were recorded over the past 24 hours. The solar wind speed ranged between 360 km/s to 451 km /s. The total interplanetary magnetic field ranged from 4 to 9 nT, with the Bz reaching a minimum of -8 nT. The phi-angle was in the negative sector (directed towards the Sun) until it switched to the positive sector at 00:11 UTC on April 25. The wind conditions are expected to become enhanced in the next 24 hours, due to the arrival of high-speed streams associated with SIDC Coronal Hole 157 and SIDC Coronal Hole 156.

Geomagnetism

The geomagnetic conditions were globally quiet to unsettles (Kp 1-3) and reached active conditions locally (k BEL 4) in the last 24 hours. Unsettled to active conditions are expected over the next 24 hours.

Proton flux levels

The greater than 10 MeV GOES proton flux became slightly enhanced but remained below the 10 pfu threshold and is expected to remain at background levels over the next 24 hours.

Electron fluxes at geostationary orbit

The greater than 2 MeV electron flux, as measured by GOES-19 was above the 1000 pfu alert threshold at the start of the period and dropped below the threshold at 20:35 UTC on April 24 for the remainder of the period. The 2 MeV electron flux is expected to remain below the threshold during the next 24 hour. The 24-hour electron fluence was at moderate levels over the past 24 hours and is expected to return to normal levels over the next 24 hours.

Today's estimated international sunspot number (ISN): 121, based on 17 stations.

Solar indices for 24 Apr 2026

Wolf number Catania	101
10cm solar flux	146
AK Chambon La Forêt	020
AK Wingst	012
Estimated Ap	011
Estimated international sunspot number	101 - Based on 32 stations

Noticeable events summary

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

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