Affichage des archives de lundi, 3 février 2025

Bulletin quotidien sur l'activité solaire et géomagnétique du SIDC

Publié: 2025 Feb 03 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
03 Feb 2025	220	016
04 Feb 2025	222	021
05 Feb 2025	226	012

Régions solaires actives et éruptions solaires

Solar flaring activity reached high levels, with 10 M-class flares and several C-class flares recorded over the past 24 hours. The largest flare was an M8.8 flare (SIDC Flare 3465) peaking at 03:58 UTC on February 03, associated with SIDC Sunspot Group 391 (NOAA Active Region 3981). There are currently eight numbered active regions visible on the solar disk. SIDC Sunspot Group 391 (NOAA Active Region 3981), that has grown in size and became magnetically more complex (from beta to beta-gamma-delta) was the main driver of the flaring activity observed over the past 24 hours together with SIDC Sunspot Group 368 (NOAA Active Region 3977, beta-gamma). Low flaring activity was also produced by SIDC Sunspot Group 389 (NOAA Active Region 3979; beta), that is currently approaching the west limb. Solar flaring activity is expected to be moderate over the next 24 hours, with M-class flares likely and a small chance for X-class flares.

Éjection de masse coronale

Two halo coronal mass ejections (CMEs) were observed in LASCO/C2 coronagraph data at 05:36 UTC and 21:24 UTC on February 02, directed primarily to the south/southwest from Earth's perspective. Both CMEs have no clear on-disk signatures and are deemed to be back-sided. Therefore, no impact on solar wind conditions near Earth is expected.

Vent solaire

Over the past 24 hours the solar wind parameters (ACE and DSCOVR) were reflecting the waning influence of a high speed stream (HSS). The solar wind speed decreased from values about 580 km/s to 450 km/s. The interplanetary magnetic field was about 11 nT. The southward component of the interplanetary magnetic field fluctuated between -6 nT and 10 nT, being mainly positive. The magnetic field orientation was predominantly in the positive sector (field directed away from the Sun). The solar wind conditions are expected to remain disturbed in the next 24 hours due to the ongoing influence of the HSS and a possible arrival of a CME that left the Sun on January 30.

Géomagnétisme

The geomagnetic conditions over the past 24 hours reached active conditions both globally and locally, over Belgium (NOAA Kp: 4+, K Bel: 4). Geomagnetic conditions are expected to be mostly at quiet to unsettled levels, with a chance of reaching active or minor storm conditions over the next 24 hours, due to possible CME arrival.

Niveaux de flux de protons

Over the past 24 hours, the greater than 10 MeV GOES proton flux was at nominal 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, remained below the 1000 pfu alert threshold, and it is expected to remain below the threshold during the next 24 hours. The 24h electron fluence was at normal levels and is expected to remain at these levels.

Estimation du nombre international de taches solaires (ISN) pour aujourd'hui : 179, sur la base de 16 stations.

Indices solaires pour 02 Feb 2025

Nombre de Wolf, observé par Catania	///
Flux solaire à 10 cm	216
AK Chambon La Forêt	019
AK Wingst	020
Ap estimé	022
Nombre international de taches solaires estimé	168 - Basé sur 20 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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