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Bulletin quotidien sur l'activité solaire et géomagnétique du SIDC

Publié: 2025 Nov 25 1232 UTC

Prévisions SIDC

Éruptions solaires

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

Géomagnétisme

Minor storm expected (A>=30 or K=5)

Moniteur de Flux de Proton

Quiet

	Flux de 10 cm	Ap
25 Nov 2025	118	038
26 Nov 2025	118	031
27 Nov 2025	118	031

Régions solaires actives et éruptions solaires

Solar flaring activity was low over the past 24 hours, with few C-class flares recorded. The largest flare was a C1.5 flare (SIDC Flare 6193), peaking on November 24 at 22:03 UTC, associated with SIDC Sunspot Group 705 (NOAA Active Region 4290; magnetic type alpha). There are currently seven numbered active regions on the visible solar disk. SIDC Sunspot Group 706 (NOAA Active Region 4291; magnetic type beta-gamma) is the largest and most complex active region but remained quiet. The remaining active regions are relatively simple (magnetic type alpha or beta) and did not produce any significant flaring activity. Solar flaring activity is expected to be low over the next 24 hours, with C-class flares very likely and a chance for M-class flares.

Éjection de masse coronale

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

Vent solaire

Over the past 24 hours, solar wind parameters (ACE and DSCOVR) reflected the influence of a high-speed stream (HSS), probably originating from a positive polarity coronal hole (SIDC Coronal Hole 128). The solar wind speed increased from 700 to 810 km/s. The interplanetary magnetic field reached values up to 13 nT before decreasing to around 7 nT. The southward component of the interplanetary magnetic field fluctuated between -10 nT and 8 nT. The magnetic field orientation was predominantly in the positive sector (field directed away from the Sun). Solar wind conditions are expected to remain slightly elevated over the next few days under the continued influence of the high-speed stream.

Géomagnétisme

Geomagnetic conditions reached minor storm levels (NOAA Kp = 5-, 5) between 00:00 and 03:00 UTC and betwen 06:00 and 09:00 UTC on November 25, due to the ongoing influence of a high-speed stream (HSS). Locally, minor storm conditions were observed over Belgium (K-Bel = 5) between 12:00 and 15:00 UTC on November 24. Mostly unsettled to active geomagnetic conditions are expected over the next 24 hours, with a chance of isolated minor storm periods due to the influence of the high-speed stream.

Niveaux de flux de protons

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 days.

Flux d'électrons sur l'orbite géostationnaire

The greater than 2 MeV electron flux measured by GOES 18 and GOES 19 was below the 1000 pfu threshold. The greater than 2 MeV electron flux may exceed the 1000 pfu threshold over the next 24 hours. The 24-hour electron fluence was at normal levels and is expected to be at normal to moderate levels over the next 24 hours.

Estimation du nombre international de taches solaires (ISN) pour aujourd'hui : 100, sur la base de 10 stations.

Indices solaires pour 24 Nov 2025

Nombre de Wolf, observé par Catania	119
Flux solaire à 10 cm	116
AK Chambon La Forêt	038
AK Wingst	022
Ap estimé	023
Nombre international de taches solaires estimé	104 - Basé sur 17 stations

Résumé des événements marquants

Données fournies par le Solar Influences Data analysis Center© - SIDC - Traité par SpaceWeatherLive

Toutes les heures sont indiquées en UTC

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