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Bulletin quotidien sur l'activité solaire et géomagnétique du SIDC

Publié: 2025 Jan 28 1231 UTC

Prévisions SIDC

Éruptions solaires

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

Géomagnétisme

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

Moniteur de Flux de Proton

Quiet

	Flux de 10 cm	Ap
28 Jan 2025	158	010
29 Jan 2025	168	011
30 Jan 2025	174	014

Régions solaires actives et éruptions solaires

A total of 8 numbered sunspot groups were identified on the disk over the past 24 hours. Solar flaring activity was low over the past 24 hours, with only C-class flares recorded. The largest flare was a C3.4 flare peaking on November 27 at 16:44 UTC, which was produced by SIDC Sunspot Group 388 (NOAA Active Region 3976). SIDC Sunspot Group 383 (NOAA Active Region 3971) is the most magnetically complex region on disk with a beta-gamma configuration and has started to rotate over the west limb out of view. Solar flaring activity is expected to be moderate over the next 24 hours, with C-class flares expected and M-class flares likely.

Éjection de masse coronale

No Earth-directed Coronal Mass Ejections (CMEs) have been detected in the available coronagraph images.

Trous coronaux

Returning SIDC Coronal Hole 82 (equatorial coronal hole with a positive polarity) and returning SIDC Coronal Hole 60 (mid-latitude coronal hole with a positive polarity) both began to cross central meridian on January 28.

Vent solaire

Over the past 24 hours the Earth was under the slow solar wind regime. The solar wind speed ranged from 270 km/s to 330 km/s and the total interplanetary magnetic field ranged from 4 nT to 9 nT, with the Bz component reaching a minimum of -7 nT. The phi-angle was mainly in the negative sector (directed towards the Sun) with periods in the positive sector. The solar wind conditions can become disturbed in the next 24 hours due to the arrival of a CME that left the Sun on January 25th.

Géomagnétisme

The geomagnetic conditions over the past 24 hours have been quiet to unsettled globally (Kp 1 - 3) and reached active conditions locally (K Bel 4). Active to minor storm conditions are expected for the next 24 hours.

Niveaux de flux de protons

Over the past 24 hours the greater than 10 MeV GOES proton flux was at background levels and is expected to remain so over the next days.

Flux d'électrons sur l'orbite géostationnaire

The greater than 2 MeV electron flux, as measured by the GOES-16 satellite, was above the threshold level from 14:10 UTC to 16:20 UTC on Jan 27. The electron flux is expected to remain below the threshold in the coming 24 hours. The 24h electron fluence is presently at normal level, and it is expected to remain so in the next 24 hours.

Estimation du nombre international de taches solaires (ISN) pour aujourd'hui : 075, sur la base de 04 stations.

Indices solaires pour 27 Jan 2025

Nombre de Wolf, observé par Catania	063
Flux solaire à 10 cm	162
AK Chambon La Forêt	012
AK Wingst	007
Ap estimé	006
Nombre international de taches solaires estimé	053 - Basé sur 21 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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