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Tägliches Bulletin zur solaren und geomagnetischen Aktivität des SIDC

Ausgestellt: 2025 Jul 19 1231 UTC

Vorhersage des SIDC

Sonneneruptionen

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

Geomagnetismus

Quiet (A<20 and K<4)

Sonnenprotonen

Quiet

	10cm Fluss	Ap
19 Jul 2025	156	011
20 Jul 2025	150	009
21 Jul 2025	140	007

Solaraktive Regionen und Flares

Solar flaring activity was low over the past 24 hours, with only three C-class flares identified. SIDC Sunspot Group 525 (NOAA Active Region [AR] 4135) produced the brightest flare, SIDC flare 4915 (a C3) on 19 Jul at 09:07 UTC. SIDC Sunspot Group 522 (NOAA AR 4136, Beta-Gamma magnetic configuration) produced the remaining flares, including the double flare SIDC flare 4913 (a C2) at 13:09 on 18 Jul. Further infrequent flaring activity is expected in the next 24 hours.

Koronaler Massenauswurf

No Earth-directed Coronal Mass Ejections (CME) were observed in the last 24 hours.

Sonnenwind

During the past 24 hours the effects of the High Speed Stream (HSS) that arrived on 11 July subsided and the Solar Wind (SW) conditions are very gradually returning to a slow SW regime. The SW speed varied between 490 and 590 km/s, while the interplanetary magnetic field (B) ranged between 2 and 7 nT. Its North-South component (Bz) fluctuated between -6 and 6 nT. The SW conditions are expected to remain at the same levels in the next 24 hours.

Geomagnetismus

The global geomagnetic conditions reached active levels (NOAA Kp 4) for the interval of 12:00 to 15:00 UTC on 18 Jul. The rest of the past 24 hours they varied between unsettled and quiet levels (NOAA Kp 1 to 3). The local geomagnetic conditions reached active levels (K BEL 4) for the interval of 12:00 to 18:00 UTC on 18 Jul. The rest of the past 24 hours they were at quiet levels (K BEL 1 to 2). Quiet to unsettled conditions are expected to prevail in the next 24 hours.

Protonenflusswerte

The greater than 10 MeV proton flux, as measured by the GOES-19 satellite, was at background levels over the past 24 hours and is expected to remain so in the next 24 hours.

Elektronenflüsse im geostationären Orbit

The greater than 2 MeV electron flux, as measured by GOES 19, was above the 1000 pfu alert threshold during the past 24 hours. It is expected wane and fluctuate around the threshold level in the next 24 hours. The 24-hour electron fluence was at moderate levels during the past 24 hours and is expected to remain at this level in the next 24 hours.

Die heute international geschätzte Sonnenfleckenanzahl (ISN): 162, basierend auf 14 Stationen.

Solarindizes für den 18 Jul 2025

Wolf-Zahl Catania	213
10cm Solarflux	156
AK Chambon La Forêt	023
AK Wingst	016
Geschätzer Ap-Wert	015
Geschätzte internationale Sonnenfleckenzahl	173 - Basierend auf 27 Stationen

Zusammenfassung auffälliger Ereignisse

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

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