Affichage des archives de lundi, 27 janvier 2025

Bulletin quotidien sur l'activité solaire et géomagnétique du SIDC

Publié: 2025 Jan 27 1231 UTC

Prévisions SIDC

Éruptions solaires

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

Géomagnétisme

Quiet (A<20 and K<4)

Moniteur de Flux de Proton

Quiet

	Flux de 10 cm	Ap
27 Jan 2025	189	003
28 Jan 2025	187	004
29 Jan 2025	183	006

Régions solaires actives et éruptions solaires

A total of 9 numbered sunspot groups were identified on the disk over the past 24 hours. Solar flaring activity was moderate over the past 24 hours, with 1 M-class flares identified. This flare was a M2.69 flare peaking on November 27 at 08:10 UTC, which was produced by a region over the east limb in the northern hemisphere of the Sun. SIDC Sunspot Group 383 (NOAA Active Region 3971) is the most magnetically complex region on disk with a beta-gamma configuration. SIDC Sunspot Group 346 (NOAA Active Region 3961) has rotated over the west limb out of view. Solar flaring activity is expected to be moderate over the next 24 hours, with M-class flares very likely and a small chance for X-class flares.

Éjection de masse coronale

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

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 380 km/s and the total interplanetary magnetic field ranged from 1 nT to 7 nT, with the Bz component reaching a minimum of -3 nT. The phi-angle was mainly in the negative sector (directed towards the Sun). Similar slow solar wind conditions are expected for the next 24 hours.

Géomagnétisme

The geomagnetic conditions over the past 24 hours have been quiet locally and globally (K BEL 1–2 and Kp 1–2). Quiet 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 below the 1000 pfu threshold level over the past 24 hours. However, greater than 2 MeV electron flux, as measured by the GOES-18 satellite, was slightly above the threshold level from 18:45 UTC to 22:40 UTC on Jan 26. The electron flux is expected to remain below the threshold in the coming 24 hours, though crossing the threshold level cannot be excluded. 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 : 053, sur la base de 13 stations.

Indices solaires pour 26 Jan 2025

Nombre de Wolf, observé par Catania	///
Flux solaire à 10 cm	171
AK Chambon La Forêt	005
AK Wingst	002
Ap estimé	002
Nombre international de taches solaires estimé	109 - Basé sur 12 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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