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Daily bulletin on solar and geomagnetic activity from the SIDC

Emesso: 2026 Apr 22 1231 UTC

SIDC Forecast

Brillamenti solari

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

Geomagnetism

Quiet (A<20 and K<4)

Protoni solari

Quiet

	10cm flux	Ap
22 Apr 2026	118	008
23 Apr 2026	122	008
24 Apr 2026	126	007

Solar Active Regions and flaring

Solar flaring activity was low over the past 24 hours, with only C-class flares identified. A total of 4 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 (Beta-Gamma) regions on disk. The largest flare was a C1.9 flare (SIDC Flare 7436) peaking on April 21 at 14:24 UTC, which was produced by SIDC Sunspot Group 847. Solar flaring activity is expected to be low over the next 24 hours, with C-class flares very likely and a chance for M-class flares.

Espulsioni di massa coronale

A Coronal Mass Ejection (CME) was observed LASCO-C2 data around 23:00 UTC on April 20. This CME is associated with a filament eruption centred around N21, E05, with a speed around 430 km/s. The bulk of the material is expected to travel North and most likely to miss the Earth a glancing blow arrival is possible on April 25 around 09:00 UTC.

Fori coronali

SIDC Coronal Hole 157 (equatorial coronal hole extending to the polar south with a positive polarity) is continuing to cross the central meridian. SIDC Coronal Hole 156 (equatorial coronal hole with a positive polarity) started crossing the central meridian on April 22.

Vento solare

Over the past 24 hours the solar wind parameters were under the waning influence of a high-speed stream associated with SIDC Coronal Hole 147. The solar wind speed ranged between 474 km/s to 577 km /s. The total interplanetary magnetic field ranged from 3 to 6 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. Quite solar wind conditions are expected in the next 24 hours.

Geomagnetism

The geomagnetic conditions reached active conditions globally (Kp 4) and minor storm conditions locally (K BEL 5) in the last 24 hours. Quiet to unsettled 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 fluctuate around 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): 075, based on 21 stations.

Solar indices for 21 Apr 2026

Wolf number Catania	079
10cm solar flux	112
AK Chambon La Forêt	020
AK Wingst	022
Estimated Ap	021
Estimated international sunspot number	056 - Based on 32 stations

Noticeable events summary

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

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