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Tägliches Bulletin zur solaren und geomagnetischen Aktivität des SIDC

Ausgestellt: 2025 Sep 19 1231 UTC

Vorhersage des SIDC

Sonneneruptionen

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

Geomagnetismus

Quiet (A<20 and K<4)

Sonnenprotonen

Quiet

	10cm Fluss	Ap
19 Sep 2025	150	003
20 Sep 2025	151	004
21 Sep 2025	150	005

Solaraktive Regionen und Flares

Solar flaring activity was at low levels over the past 24 hours with only C-class flares identified. A total of 7 numbered sunspot groups were identified on the visible solar disk with SIDC Sunspot Group 637 (NOAA Active Region 4220) growing to be the largest and most complex active region, being classified as magnetic type beta-gamma- delta. This region was responsible for most of the flaring activity over the past 24 hours, including a C3.6 flare (SIDC Flare 5515) with peak time at 15:41 UTC on Sept 18. The remaining regions are classified as magnetic type beta. Isolated low C-class flaring was produced by SIDC Sunspot Group 639 (NOAA Active Region 4219) and SIDC Sunspot Group 643 (NOAA Active Region 4223). The solar flaring activity over the next 24 hours is expected to be at low to moderate levels with very likely C-class flares and 60% chances for M-class flaring.

Koronaler Massenauswurf

No Earth-directed coronal mass ejections (CMEs) have been identified in the available coronagraph imagery over the past 24 hours.

Koronale Löcher

A mid-latitude negative polarity coronal hole (SIDC Coronal Hole 126) has reached the central meridian on Sept 19. A high speed stream emanating from this coronal hole is expected to reach the Earth on Sept 22.

Sonnenwind

Over the past 24 hours the solar wind parameters (as measured by ACE) have returned to slow solar wind conditions. The solar wind speed has further decreased to 400 km/s. The magnitude of the interplanetary magnetic field, B, remained weak with a maximum of 4.5 nT and a minimum Bz component of - 2.7 nT. The B field phi angle remained predominantly in the negative sector (directed towards the Sun). The solar wind conditions are expected to be at background slow solar wind levels over the next days.

Geomagnetismus

The geomagnetic conditions over the past 24 hours were globally quiet with quiet to unsettled levels registered locally over Belgium. The geomagnetic conditions over the next days are expected to be predominantly quiet.

Protonenflusswerte

Over the past 24 hours the greater than 10 MeV GOES proton flux has been at nominal levels and is expected to remain at nominal levels over the next 24 hours, pending no explosive eruptive activity related to the evolution of SIDC Sunspot Group 637 (NOAA Active Region 4220).

Elektronenflüsse im geostationären Orbit

The greater than 10 MeV GOES electron flux has been entirely above the 1000 pfu threshold over the last 24 hours and is expected to exceed the threshold for long periods of time over the next 24 hours. The 24-hour electron fluence was at moderate levels and is expected to remain at moderate levels over the next days.

Die heute international geschätzte Sonnenfleckenanzahl (ISN): 145, basierend auf 17 Stationen.

Solarindizes für den 18 Sep 2025

Wolf-Zahl Catania	154
10cm Solarflux	150
AK Chambon La Forêt	009
AK Wingst	007
Geschätzer Ap-Wert	007
Geschätzte internationale Sonnenfleckenzahl	137 - Basierend auf 18 Stationen

Zusammenfassung auffälliger Ereignisse

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

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