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Tägliches Bulletin zur solaren und geomagnetischen Aktivität des SIDC

Ausgestellt: 2025 Sep 23 1231 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
23 Sep 2025	173	018
24 Sep 2025	174	008
25 Sep 2025	172	013

Solaraktive Regionen und Flares

Solar flaring activity was low over the past 24 hours, with only C-class flares. The strongest flare was a C4.2 flare (SIDC Flare 5543) peaking at 16:09 UTC on September 22 from beyond the east limb. There are currently thirteen numbered active regions on the solar disk. The most complex one is SIDC Sunspot Group 640 (NOAA Active Region 4217) with magnetic type beta-gamma. SIDC Sunspot Group 621 (NOAA Active Region 4216, magnetic type alpha) and SIDC Sunspot Group 637 (NOAA Active Region 4220, magnetic type beta) are currently rotating over the west limb. SIDC Sunspot Group 647 has decayed into a plage region. SIDC Sunspot Group 648 (magnetic type beta) has rotated on disc from the east limb. SIDC Sunspot Groups 649 and 650 (both magnetic type beta) have emerged near the center of the disk. The solar flaring activity is expected to be moderate over the next 24 hours, with C-class flares expected and M-class flares likely.

Koronaler Massenauswurf

A wide Coronal Mass Ejection (SIDC CME 561), was observed in LASCO/C2 and C3 coronagraph imagery starting from around 22:30 UTC on September 22, lifting off the north limb. No clear source was identified on the visible disk, suggesting a backsided event that will not impact Earth. A narrow Coronal Mass Ejection (SIDC CME 562) was observed in LASCO/C2 and C3 coronagraph imagery around 00:00 UTC on September 23, lifting off the southwest limb. It is associated with a prominence eruption observed in AIA 304 data around 22:00 UTC on September 22 at the southwest limb, and it is not expected to impact Earth. No other Earth-directed CMEs were observed in the available coronagraph imagery.

Sonnenwind

Over the past 24 hours, the solar wind parameters (ACE) continue to reflect the ongoing influence of the high-speed stream associated with the mid-latitude negative polarity coronal hole (SIDC Coronal Hole 126). Speed values continued to increase from approximately 430 km/s to the current value of approximately 580 km/s. The interplanetary magnetic field values varied between 6 nT and 18 nT. The Bz component varied between -13 nT and 17 nT. The interplanetary magnetic field angle was mostly in the negative sector. Enhanced solar wind conditions are expected over the next 24 hours under the waning influence of the high- speed stream associated with SIDC Coronal Hole 126.

Geomagnetismus

Geomagnetic conditions globally were mostly at unsettled levels (NOAA Kp 3). Geomagnetic conditions locally were mostly at quite to unsettled levels (K BEL 2 to 3). Mostly quiet to unsettled conditions are expected globally and locally over the next 24 hours.

Protonenflusswerte

The greater than 10 MeV proton flux was below the 10 pfu threshold level over the past 24 hours. It is expected to remain below the threshold level over the next 24 hours.

Elektronenflüsse im geostationären Orbit

The greater than 2 MeV electron flux measured by GOES 18 was over the 1000 pfu threshold until 18:30 UTC on September 22. The greater than 2 MeV electron flux measured by GOES 18 was mostly below the 1000 pfu threshold in the last 24 hours and exceed the 1000 pfu threshold between 17:00 UTC and 19:30 UTC on September 22. The greater than 2 MeV electron flux is expected to remain around the 1000 pfu threshold levels in the next 24 hours. The 24-hour electron fluence is presently at normal levels and is expected to remain so over the next 24 hours.

Die heute international geschätzte Sonnenfleckenanzahl (ISN): 197, basierend auf 12 Stationen.

Solarindizes für den 22 Sep 2025

Wolf-Zahl Catania	///
10cm Solarflux	172
AK Chambon La Forêt	025
AK Wingst	014
Geschätzer Ap-Wert	014
Geschätzte internationale Sonnenfleckenzahl	165 - Basierend auf 24 Stationen

Zusammenfassung auffälliger Ereignisse

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

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