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Tägliches Bulletin zur solaren und geomagnetischen Aktivität des SIDC

Ausgestellt: 2026 Apr 30 1245 UTC

Vorhersage des SIDC

Sonneneruptionen

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

Geomagnetismus

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

Sonnenprotonen

Quiet

	10cm Fluss	Ap
30 Apr 2026	144	013
01 May 2026	143	018
02 May 2026	142	023

Solaraktive Regionen und Flares

Solar flaring activity was low over the past 24 hours, with only C-class flares identified. The largest flare was a C5.1 flare (SIDC Flare 7575) peaking on April 30 at 00:31 UTC, which was produced by SIDC Sunspot Group 851 (NOAA Active Region 4424). During the flare, the source region (SIDC Sunspot Group 851) of the flare had beta configuration of its photospheric magnetic field. A total of 10 numbered sunspot groups were identified on the disk over the past 24 hours. SIDC Sunspot Group 847 (NOAA Active Region 4420) is the most complex group with its beta-gamma-delta magnetic configuration, but it has produced only C-class flares in the past 24 hours. Solar flaring activity is expected to be low to moderate over the next 24 hours, with few C-class flares, possibly M-class flares and a low chance for X-class flares.

Koronaler Massenauswurf

No Earth-directed coronal mass ejections (CMEs) were detected in the available coronagraph observations during the last 24 hour.

Sonnenwind

Earth is presently within the slow solar wind regime, but the speed has increased from 295 km/s to 400 km/s. The North-South component (Bz) ranged between -9 and 7 nT. The interplanetary magnetic field ranged between 1 nT to 11 nT. This is possibly due to the influence of solar wind from the SIDC Coronal Hole 149, which crossed the central meridian during Apr 26-28 (recurrent, negative polarity). In the next 24 hours, enhanced solar wind conditions may be expected with the further arrival of high speed streams from the same coronal hole.

Geomagnetismus

Geomagnetic conditions were globally and locally quiet (NOAA Kp 0 to 1 and K BEL 1 to 2). In the next 24 hours, active to minor storm conditions (K 4 to 5) are possible if the high speed streams from the SIDC Coronal Hole 149, which crossed the central meridian during Apr 26-28 (negative polarity), arrives at Earth.

Protonenflusswerte

The greater than 10 MeV GOES proton flux was below the threshold level over the past 24 hours and it is expected to remain so for the next 24 hours.

Elektronenflüsse im geostationären Orbit

The greater than 2 MeV electron flux, as measured by GOES-19 and GOES-18 satellites, remained below the threshold level over the past 24 hours and is expected to remain so in the coming 24 hours. The 24h electron fluence is presently at moderate level and is expected to remain so in the next 24 hours.

Die heute international geschätzte Sonnenfleckenanzahl (ISN): 151, basierend auf 22 Stationen.

Solarindizes für den 29 Apr 2026

Wolf-Zahl Catania	171
10cm Solarflux	143
AK Chambon La Forêt	010
AK Wingst	006
Geschätzer Ap-Wert	004
Geschätzte internationale Sonnenfleckenzahl	135 - Basierend auf 29 Stationen

Zusammenfassung auffälliger Ereignisse

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

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