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Dagelijks bulletin over zonne- en geomagnetische activiteit van het SIDC

Datum verslag: 2026 Apr 21 1231 UTC

SIDC Prognose

Zonnevlammen

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

Geomagnetisme

Minor storm expected (A>=30 or K=5)

Proton Flux monitor

Quiet

	10cm flux	Ap
21 Apr 2026	109	016
22 Apr 2026	114	020
23 Apr 2026	120	010

Zonnevlekkengebieden en zonnevlammen

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) is the largest and most magnetically complex (Beta-Gamma) regions on disk. 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.

Coronale massa uitstoten

No Earth directed Coronal Mass Ejections (CMEs) were observed in the past 24 hours. Further analysis of the CME seen LASCO-C2 data around 16:00 UTC on April 19 show that it is not expected to impact the Earth.

Coronale gaten

SIDC Coronal Hole 157 (equatorial coronal hole extending to the polar-south with a positive polarity) has started crossing the central meridian on April 21. (Other crossing times : April 04)

Zonnewind

Over the past 24 hours the solar wind parameters were under the influence of a high-speed stream associated with SIDC Coronal Hole 147. The solar wind speed ranged between 444 km/s to 573 km /s. The total interplanetary magnetic field ranged from 4 to 10 nT, with the Bz reaching a minimum of -8 nT. The phi-angle was mainly in the negative sector (directed towards the Sun), with periods in the positive sector. In the next 24 hours solar wind conditions are expected to remain enhanced.

Geomagnetisme

The geomagnetic conditions reached minor storm conditions globally and locally (Kp 5 & K BEL 5) in the last 24 hours. Active to minor storm conditions are expected over the next 24 hours.

Proton flux niveaus

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.

Elektronenfluxen in geostationaire baan

The greater than 2 MeV electron flux, as measured by GOES-18 was above the 1000 pfu alert threshold between 16:55 UTC and 23:45 UTC on April 20, in the past 24 hours. The flux as measured by GOES-18 and GOES-19 is expected to fluctuate around the alert threshold over the next 24 hours. The 24-hour electron fluence was at normal levels over the past 24 hours and is expected to remain at these levels over the next 24 hours.

Het geschatte internationale zonnevlekkengetal (ISN) van vandaag: 053, gebaseerd op 23 stations.

Zon indexen voor 20 Apr 2026

Wolfgetal Catania	044
10cm zonneflux	105
AK Chambon La Forêt	041
AK Wingst	030
Geschatte Ap	028
Geschat internationaal zonnevlekkengetal	042 - Gebaseerd op 32 stations

Overzicht opvallende gebeurtenissen

Aangeboden door het Solar Influences Data Analysis Center© - SIDC - Verwerkt door SpaceWeatherLive

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