Affichage des archives de vendredi, 29 août 2025

Bulletin quotidien sur l'activité solaire et géomagnétique du SIDC

Publié: 2025 Aug 29 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
29 Aug 2025	232	007
30 Aug 2025	234	007
31 Aug 2025	234	007

Régions solaires actives et éruptions solaires

A total of 16 numbered sunspot groups were identified on the disk over the past 24 hours. Solar flaring activity was high over the past 24 hours, with 5 M-class flares identified. The largest flare was a M1.5 flare (SIDC Flare 5260) peaking on August 28 at 20:40 UTC, which was produced by SIDC Sunspot Group 621 (NOAA Active Region 4203). Solar flaring activity is expected to be moderate over the next 24 hours, with M-class flares likely.

Éjection de masse coronale

No Earth-directed Coronal Mass Ejections (CMEs) have been observed in the last 24 hours.

Trous coronaux

A narrow equatorial negative polarity coronal hole crossed central meridian on 28 August, its associated high speed stream may be expected at the Earth on 1 September.

Vent solaire

The Earth is inside slow solar wind with speeds around 400 km/s and interplanetary magnetic fields of about 7 nT (directed towards the Sun, negative polarity). Similar conditions can be expected for the coming 24 hours.

Géomagnétisme

Geomagnetic conditions have been quiet to unsettled (Kp between 0 and 3 and K_Bel 0 and 2). Similar conditions are expected for the next 24 hours.

Niveaux de flux de protons

The greater than 10 MeV proton flux has been below the 10 pfu threshold. It is expected to remain at nominal levels.

Flux d'électrons sur l'orbite géostationnaire

The greater than 2 MeV electron flux as measured by GOES 18 and 19 remained below the 1000 pfu alert threshold, similar conditions expected for the next 24 hours. The 24 h electron fluence was at normal levels and is expected to remain so.

Estimation du nombre international de taches solaires (ISN) pour aujourd'hui : 211, sur la base de 17 stations.

Indices solaires pour 28 Aug 2025

Nombre de Wolf, observé par Catania	204
Flux solaire à 10 cm	232
AK Chambon La Forêt	013
AK Wingst	007
Ap estimé	008
Nombre international de taches solaires estimé	201 - Basé sur 15 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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