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Tägliches Bulletin zur solaren und geomagnetischen Aktivität des SIDC

Ausgestellt: 2026 Mar 31 1231 UTC

Vorhersage des SIDC

Sonneneruptionen

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

Geomagnetismus

Moderate (ISES: Major) magstorm expected (A>=50 or K=6)

Sonnenprotonen

Quiet

	10cm Fluss	Ap
31 Mar 2026	149	039
01 Apr 2026	145	017
02 Apr 2026	142	012

Solaraktive Regionen und Flares

Solar flaring activity was low over the past 24 hours, with only C-class flares observed. The largest event was a C2.1 flare (SIDC Flare 7293), peaking on 30 March at 20:47 UTC, originating from SIDC Sunspot Group 831 (NOAA Active Region 4402). Additional C-class flares were mainly produced by SIDC Sunspot Group 836 (NOAA Active Region 4405) and SIDC Sunspot Group 837 (NOAA Active Region 4407). A total of ten numbered sunspot groups were present on the solar disk. Most regions were simple and stable or in decay, with Alpha or Beta magnetic configurations. SIDC Sunspot Group 836 (NOAA Active Region 4405), currently located at approximately S27E27, remained the most relevant region on the disk, showing continued growth and a Beta magnetic configuration. Solar flaring activity is expected to remain low over the next 24 hours, with C-class flares very likely and a chance for isolated M-class flares, mainly from SIDC Sunspot Group 836 (NOAA Active Region 4405).

Koronaler Massenauswurf

No Earth-directed coronal mass ejections were detected in available coronagraph imagery over the past 24 hours.

Koronale Löcher

SIDC Coronal Hole 149, an equatorial coronal hole with negative polarity, reached the central meridian on 30 March and is currently still transiting it. This coronal hole previously crossed the central meridian on 04 March.

Sonnenwind

olar wind parameters were at slow to moderately enhanced levels over the past 24 hours. Solar wind speed ranged between approximately 400 and 510 km/s. The interplanetary magnetic field (IMF) was at moderate levels, with the total field (Bt) varying between about 3 and 9 nT. The southward IMF component (Bz) showed variable conditions, with alternating northward and southward intervals, including several negative excursions reaching approximately -7 nT. Solar wind conditions are expected to become disturbed over the next 24 hours due to the anticipated arrival of the interplanetary coronal mass ejection (SIDC CME 644) associated with the X1.4 flare (SIDC Flare 7290), possibly combined with or followed by the high-speed solar wind stream originating from the equatorial coronal hole (SIDC Coronal Hole 149, negative polarity). This may result in enhanced and more complex solar wind conditions.

Geomagnetismus

Geomagnetic conditions were quiet to unsettled over the past 24 hours, with the global NOAA Kp index reaching up to 3 and local K indices (Belgium) remaining at quiet to unsettled levels. Geomagnetic conditions are expected to become active to storm levels (up to 6-7). over the next 24 hours due to the anticipated arrival of the interplanetary coronal mass ejection (SIDC CME 644).

Protonenflusswerte

The greater than 10 MeV proton flux remained at background levels over the past 24 hours. No proton event was observed. The greater than 10 MeV proton flux is expected to remain at background levels over the next 24 hours.

Elektronenflüsse im geostationären Orbit

The greater than 2 MeV electron flux remained at normal to moderate levels over the past 24 hours, with values generally below the high flux threshold and occasional fluctuations. The 24-hour fluence remained at normal level. Electron fluxes are expected to remain at normal to moderate levels over the next 24 hours, with a possibility of increasing to high levels in the coming days due to the anticipated arrival of a high-speed solar wind stream. The fluence is expected to remain at normal level.

Die heute international geschätzte Sonnenfleckenanzahl (ISN): 142, basierend auf 14 Stationen.

Solarindizes für den 30 Mar 2026

Wolf-Zahl Catania	///
10cm Solarflux	152
AK Chambon La Forêt	013
AK Wingst	011
Geschätzer Ap-Wert	011
Geschätzte internationale Sonnenfleckenzahl	145 - Basierend auf 23 Stationen

Zusammenfassung auffälliger Ereignisse

Zur Verfügung gestellt vom Solar Influences Data Analysis Center© - SIDC - Verarbeitet von SpaceWeatherLive

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