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Tägliches Bulletin zur solaren und geomagnetischen Aktivität des SIDC

Ausgestellt: 2025 Jan 20 1301 UTC

Vorhersage des SIDC

Sonneneruptionen

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

Geomagnetismus

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

Sonnenprotonen

Quiet

	10cm Fluss	Ap
20 Jan 2025	235	019
21 Jan 2025	235	013
22 Jan 2025	236	007

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 C8.2 flare peaking on Jan 19 at 17:08 UTC, which was produced by SIDC Sunspot Group 342 (NOAA Active Region 3959). During the flare, the source region (SIDC 342) of the flare had beta configuration of its photospheric magnetic field. SIDC 346 is the most complex region (beta-gamma-delta magnetic configuration). The solar flaring activity is expected to be at low to moderate levels over the next 24 hours with C-class flares expected, M-class flares probable, and a chance of X-class flares.

Koronaler Massenauswurf

No Earth-directed CMEs were detected in the available coronagraph observations during the last 24 hour.

Sonnenwind

Earth continues to be under the influence of high speed streams (HSSs) from the elongated, negative polarity coronal hole which crossed the central meridian on Jan 17. The solar wind speed ranged from 415 km/s to 655 km/s. The North-South component (Bz) ranged between -10 nT and 9 nT. The interplanetary magnetic field ranged between 2 nT and 10 nT. In the next 24 hours, we expect a gradual transition from fast to slow solar wind.

Geomagnetismus

Geomagnetic conditions were globally at unsettled to active conditions (NOAA Kp 3 to 4) and locally at quiet to active conditions (K_BEL 2 to 4), due to the continued impact of high speed streams from the elongated, negative polarity coronal hole which crossed the central meridian on Jan 17. We expect unsettled to active conditions (K 3 to 4) in the next 24 hours.

Protonenflusswerte

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

Elektronenflüsse im geostationären Orbit

The greater than 2 MeV electron flux, as measured by the GOES-16 satellite, was below the 1000 pfu threshold level over the past 24 hours and is expected to remain so in the coming 24 hours. However, greater than 2 MeV electron flux, as measured by the GOES-18 satellite, reached above the threshold level at 17:30 UTC and dropped below the threshold level at 23:40 UTC in the last 24 hours. The 24h electron fluence is presently at normal level, and it is expected to remain so in the next 24 hours.

Die heute international geschätzte Sonnenfleckenanzahl (ISN): 196, basierend auf 08 Stationen.

Solarindizes für den 19 Jan 2025

Wolf-Zahl Catania	///
10cm Solarflux	234
AK Chambon La Forêt	///
AK Wingst	016
Geschätzer Ap-Wert	014
Geschätzte internationale Sonnenfleckenzahl	147 - Basierend auf 08 Stationen

Zusammenfassung auffälliger Ereignisse

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

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