Het archief bekijken van woensdag 4 februari 2026

Dagelijks bulletin over zonne- en geomagnetische activiteit van het SIDC

Datum verslag: 2026 Feb 04 1231 UTC

SIDC Prognose

Zonnevlammen

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

Geomagnetisme

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

Proton Flux monitor

Quiet

	10cm flux	Ap
04 Feb 2026	178	007
05 Feb 2026	180	013
06 Feb 2026	180	029

Zonnevlekkengebieden en zonnevlammen

A total of 9 numbered sunspot groups were identified on the disk over the past 24 hours. There was one X-class flare and numerous M-class flares in the past 24 hours. All the major solar activity originates at SIDC Sunspot Group 784 (NOAA Active Region 4366) currently located at N13E07, with a Beta-Gamma-Delta magnetic configuration and growing over the past 24 hours. The largest flare was a X1.5 flare (SIDC Flare 6857) peaking on February 03 at 14:08 UTC. Solar flaring activity is expected to be high over the next 24 hours, with M-class flares very likely and X-class flares possible.

Note: there is an X-flare ongoing at the time this bulletin is been sent, it will be reported in a separated PRESTO and in tomorrow's ursigram.

Coronale massa uitstoten

No Earth directed CMEs have been detected in the last 24 hours.

Zonnewind

The solar wind speed at Earth is currently low, around 330 km/s. A sector boundary crossing was observed on February 3 at 18:30 UTC, during which the interplanetary magnetic field (IMF) orientation changed from toward to away from the Sun. Slightly disturbed solar wind conditions began at 08:00 UTC on February 4, likely caused by a minor ICME glancing blow corresponding to a CME from 30–31 January. Currently, the IMF is about 12 nT, with Bz at –3 nT. Over the next 24 hours, we expect the arrival of the ICME associated with the CME from February 2 (linked to the X8.1 flare). This ICME already passed Solar Orbiter, as measured by the MAG and SWA instruments, at 17:00 UTC on February 3, which may indicate a slightly earlier arrival at Earth —by a few hours— than the previous forecast of 06:00 UTC on February 5. Nevertheless, the actual arrival time may not shift significantly, since the ICME is propagating into very low solar wind speeds, close to 300 km/s.

Geomagnetisme

Geomagnetic conditions have been quiet in the last 24 hours (Kp and K_BEL up to 2). Moderate storm levels (K up to 6) can be expected with the ICME (from the 2 February CME) arrival on 5 February.

Proton flux niveaus

The greater than 10 MeV proton flux remained below the 10 pfu threshold in the last 24 hours. SIDC Sunspot Group 784 (NOAA Active Region 4366) is crossing the central meridian, becoming better magnetically connected with the Earth and increasing the risk of a proton storm.

Elektronenfluxen in geostationaire baan

The greater than 2 MeV electron flux as measured by GOES 18 and GOES 19 has been mostly above the 1000 pfu threshold for most of the last 24 hours. Similar conditions can be expected for the next 24 hours. The 24-hour electron fluence was at moderate levels and is expected to remain so.

Het geschatte internationale zonnevlekkengetal (ISN) van vandaag: 154, gebaseerd op 09 stations.

Zon indexen voor 03 Feb 2026

Wolfgetal Catania	223
10cm zonneflux	178
AK Chambon La Forêt	006
AK Wingst	007
Geschatte Ap	005
Geschat internationaal zonnevlekkengetal	165 - Gebaseerd op 11 stations

Overzicht opvallende gebeurtenissen

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

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