Viewing archive of Wednesday, 25 March 2026

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2026 Mar 25 1246 UTC

SIDC Forecast

Solar flares

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

Geomagnetism

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

Solar protons

Quiet

	10cm flux	Ap
25 Mar 2026	128	008
26 Mar 2026	130	021
27 Mar 2026	135	014

Solar Active Regions and flaring

Solar flaring activity was low over the past 24 hours, with six C-class flares identified. SIDC Sunspot Group (SG) 832 (NOAA Active Region [AR] 4403) produced the brightest flare, a C7 (SIDC Flare 7253) on 24 March at 17:54 UTC. SIDC SG 830 (NOAA AR 4401, Beta-Gamma magnetic configuration) and SIDC SG 826 (NOAA AR 4400, Beta magnetic configuration) also produced X-ray flares. More C-class flaring activity is expected in the next 24 hours.

Coronal mass ejections

A CME seen in LASCO-C2 images as launched on 25 Mar at 00:12 UTC is associated with SIDC SG 826 (NOAA AR 4400) and is expected to deliver a glancing blow on Earth the first half of 27 Mar.

Coronal holes

SIDC Coronal Hole 156 (equatorial coronal hole with a positive polarity) started crossing the solar meridian during the past 24 hours. An associated High Speed Stream (HSS) is expected to reach Earth on 28 March.

Solar wind

During the past 24 hours, the Solar Wind (SW) conditions were affected a glancing blow, on 25 Mar at 05:55 UTC, from a Coronal Mass Ejection (CME). This is the predicted arrival of the the CME launched on 22 Mar at 16:00 UTC and was associated with a filament eruption. As results of the effect, the SW speed increased from 500 to 630 km/s, the interplanetary magnetic field (B) increased to 10 nT, and its North-South component (Bz) varied from -8 nT to 8 nT. Another glancing blow, associated with SIDC CME 642 is expected to arrive in the next 24 hours and have a similar effect.

Geomagnetism

During the past 24 hours the global geomagnetic conditions reached the minor storm level (NOAA Kp+ 5 on 25 Mar at 06:00 - 09:00 UTC), while the rest of the time they varied between quiet and active. The local conditions were similar, but milder, during the same period of time with active conditions (K BEL 4) on 25 Mar at 15:00 - 21:00 UTC and quiet to unsettled levels for the rest of the past 24 hours. A similar pattern is expected in the next 24 hours, as another glancing blow from a CME is expected.

Proton flux levels

The greater than 10 MeV proton flux, as measured by the GOES-19 satellite, was at background levels over the past 24 hours and is likely to remain so in the next 24 hours.

Electron fluxes at geostationary orbit

During the past 24 hours, the greater than 2 MeV electron flux as measured by GOES 19 was above the 1000 pfu alert threshold and ranged between 1000 and 10000 pfu. A similar pattern is expected in the next 24 hours. The electron fluence increased to high levels on 25 Mar at 05:00 UTC. It is likely to remain at high levels in the next 24 hours.

Today's estimated international sunspot number (ISN): 119, based on 14 stations.

Solar indices for 24 Mar 2026

Wolf number Catania	139
10cm solar flux	128
AK Chambon La Forêt	024
AK Wingst	017
Estimated Ap	017
Estimated international sunspot number	113 - Based on 25 stations

Noticeable events summary

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

All times in UTC

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