Viewing archive of Friday, 24 April 2026

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2026 Apr 24 1240 UTC

SIDC Forecast

Solar flares

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

Geomagnetism

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

Solar protons

Quiet

	10cm flux	Ap
24 Apr 2026	132	007
25 Apr 2026	124	016
26 Apr 2026	120	016

Solar Active Regions and flaring

Solar flaring activity was high over the past 24 hours, with 2 X-class flares and 3 M-class flares identified. A total of 6 numbered sunspot groups were identified on the disk over the past 24 hours. SIDC Sunspot Group 825 (NOAA Active Region 4419) and SIDC Sunspot Group 847 (NOAA Active Region 4420) are the largest and most magnetically complex regions on disk (Beta-Gamma-Delta). SIDC Sunspot Group 825 produced most of the flaring activity in the last 24 hours. Producing the largest flare a X2.5 flare (SIDC Flare 7473) peaking on April 24 at 08:13 UTC, the second-largest flare a X2.4 flare (SIDC Flare 7462) peaking on April 24 at 01:07 UTC, a M4.9 flare (SIDC Flare 7466) peaking on April 23 at 17:08 UTC and a M1.7 flare (SIDC Flare 7465) peaking on April 23 at 14:00 UTC. SIDC Sunspot Group 850 (NOAA Active Region 4423) has emerged on the solar disk on the south-east quadrant of the Sun and produced a M1.9 flare (SIDC Flare 7474) peaking on April 24 at 09:07 UTC. 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.

Coronal mass ejections

A Coronal Mass Ejection (CME) was observed LASCO-C2 data around 00:33 UTC on April 24, with an estimated speed of 666 km/s. This CME is associated with X2.4 flare (SIDC Flare 7462) peaking on April 24 at 01:07 UTC. Another CME was observed LASCO-C2 data around 08:34 UTC on April 24, with an estimated speed of 1316 km/s. This CME is associated with a X2.5 flare (SIDC Flare 7473) peaking on April 24 at 08:13 UTC. Both CMEs are northwest directed and associated with SIDC Sunspot Group 825. Analysis of these CMEs is ongoing.

Coronal holes

SIDC Coronal Hole 157 (equatorial coronal hole extending to the polar south with a positive polarity) is continuing to cross the central meridian.

Solar wind

Slow solar wind conditions were recorded over the past 24 hours. The solar wind speed ranged between 372 km/s to 451 km /s. The total interplanetary magnetic field ranged from 3 to 5 nT, with the Bz reaching a minimum of -5 nT. The phi-angle was mainly in the negative sector (directed towards the Sun), with periods in the positive sector. The solar wind conditions are expected to become enhanced in the next 24 hours, due to the arrival of a high-speed stream associated with SIDC Coronal Hole 157.

Geomagnetism

The geomagnetic conditions were quiet to unsettles (Kp 1-3 & K BEL 1-3) 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 was at background levels 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-18 and GOES-19 was above the 1000 pfu alert threshold in the past 24 hours. The flux is expected to remain above the alert threshold over the next 24 hours. The 24-hour electron fluence was at moderate levels over the past 24 hours and is expected to remain at these levels over the next 24 hours.

Today's estimated international sunspot number (ISN): 100, based on 23 stations.

Solar indices for 23 Apr 2026

Wolf number Catania	///
10cm solar flux	128
AK Chambon La Forêt	009
AK Wingst	006
Estimated Ap	006
Estimated international sunspot number	073 - Based on 33 stations

Noticeable events summary

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

All times in UTC

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