Daily bulletin on solar and geomagnetic activity from the SIDC

Datum av rapporten: 2026 May 24 1231 UTC

SIDC Forecast

Solutbrott

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

Geomagnetism

Quiet (A<20 and K<4)

Diagram över protonflöde

Quiet

	10cm flux	Ap
24 May 2026	133	005
25 May 2026	136	003
26 May 2026	140	005

Solar Active Regions and flaring

Solar flaring activity was low but frequent over the past 24 hours, with more than 10 C-class flares identified. SIDC Sunspot Group (SG) 870 (NOAA Active Region [AR] 4441, Beta magnetic configuration) and SIDC SG 873 (NOAA AR 4446, Beta magnetic configuration) produced all the C-class flaring activity. Notable flares are the SIDC flares 7771 (a C5 and the brightest flare that peaked on 23 May at 22:04 UTC) and the double-peaked flares 7769 (a C2 with its highest peak on 23 May at 19:55 UTC) and 7775 (a C3 with its highest peak on 24 May at 02:37 UTC). More C-flass flaring activity is expected in the next 24 hours.

Koronamassutkastning

No Earth-directed Coronal Mass Ejections (CME) were observed in the last 24 hours. The two CME seen in LASCO-C2/SOHO images as launched on 23 May at 16:12 and 19:12 UTC are back-sided events. The CME seen in LASCO-C2/SOHO images as launched on 24 May at 09:12 UTC is associated with SIDC SG 870 and was launched close to the west limb. None of the three CME is expected to affect Earth.

Solvind

The Solar Wind (SW) conditions of the past 24 hours feature a slow SW regime. The SW speed gradually dropped from 340 and 290 km/s, the interplanetary magnetic field (B) was between 3 and 6 nT, and its North- South component (Bz) varied from -4 to 4 nT. The SW conditions are expected to remain at the current levels in the next 24 hours.

Geomagnetism

The geomagnetic conditions of the past 24 hours were at quiet levels both globally and locally (NOAA Kp 0+ to 1+ and K BEL 1 to 2). In the next 24 hours it is likely that they will continue at quiet levels.

Proton flux levels

The greater than 10 MeV proton flux, as measured by the GOES-19 satellite, was at nominal levels over the past 24 hours and is likely to remain so in 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 for past 24 hours. It reached a peak value of 4000 pfu on 23 May at 16:55 UTC. It is expected to remain at the same levels in the next 24 hours. The electron fluence was at moderate levels in the past 24 hours and it is expected to remain at the same levels in the next 24 hours.

Today's estimated international sunspot number (ISN): 118, based on 18 stations.

Solar indices for 23 May 2026

Wolf number Catania	///
10cm solar flux	137
AK Chambon La Forêt	005
AK Wingst	002
Estimated Ap	002
Estimated international sunspot number	118 - Based on 21 stations

Noticeable events summary

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