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Tägliches Bulletin zur solaren und geomagnetischen Aktivität des SIDC

Ausgestellt: 2026 Apr 18 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
18 Apr 2026	107	047
19 Apr 2026	107	028
20 Apr 2026	107	007

Solaraktive Regionen und Flares

A total of 3 numbered sunspot groups were identified on the disk over the past 24 hours. There was only 1 C-class flare detected in the last 24 hours, peaking at 07:04 UTC from SIDC Sunspot Group 844 (NOAA Active Region 4416), currently located at N19W77 and with a Beta magnetic configuration. More C-class falres can be expected in the coming 24 hours.

Koronaler Massenauswurf

No Earth directed CMEs were observed in the past 24 hours.

Koronale Löcher

There is a large equatorial coronal hole with negative polarity in the western hemisphere (SIDC Coronal Hole 147).

Sonnenwind

The fast solar wind stream from SIDC Coronal Hole 147 is arriving to the Earth. The solar wind speed rose to 550 km/s, the interplanetary magnetic field magnitude has reached 17 nT with Bz down to -14 nT. This is a large coronal hole that has increased in size since the last rotation, we can expect high speeds probably reaching 700 km/s in the coming hours. There are low chances of also observing a glancing blow from the CME that left the Sun on 15 April.

Geomagnetismus

Geomagnetic conditions have reached minor storm levels locally with K_Bel up to 5 and moderate storm levels at planetary scale with Kp up to 6-. More disturbed periods are expected in the next 24 hours (up to moderate storm levels).

Protonenflusswerte

The greater than 10 MeV proton flux, as measured by GOES-18, was below the 10 pfu threshold level over the past 24 hours and 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-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 normal to moderate levels over the past 24 hours and is expected to remain at these levels over the next 24 hours.

Die heute international geschätzte Sonnenfleckenanzahl (ISN): 047, basierend auf 17 Stationen.

Solarindizes für den 17 Apr 2026

Wolf-Zahl Catania	///
10cm Solarflux	107
AK Chambon La Forêt	020
AK Wingst	006
Geschätzer Ap-Wert	005
Geschätzte internationale Sonnenfleckenzahl	052 - Basierend auf 27 Stationen

Zusammenfassung auffälliger Ereignisse

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

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