Affichage des archives de jeudi, 7 décembre 2017

Bulletin quotidien sur l'activité solaire et géomagnétique du SIDC

Publié: 2017 Dec 07 1230 UTC

Prévisions SIDC

Éruptions solaires

Quiet conditions (<50% probability of C-class flares)

Géomagnétisme

Quiet (A<20 and K<4)

Moniteur de Flux de Proton

Quiet

	Flux de 10 cm	Ap
07 Dec 2017	070	008
08 Dec 2017	072	007
09 Dec 2017	072	007

Bulletin

The solar activity remained quiet over the past 24 hours. No C-class flare and above have been recorded. The bipolar sunspot (Catania sunspot group 65, NOAA Active Region 2690) has produced one small B-class flare. Quiet flaring conditions are expected for the next 24-hour period.

No Earth directed Coronal Mass Ejection has been observed. The greater than 10 MeV solar protons flux remained at nominal levels over the past 24 hours and is expected to remain so.

The Earth remained under the influence of the solar wind stream associated with the Coronal Hole (which has crossed the central meridian on Dec 01). The wind speed has gradually decreased from 550 km/s to 500 km/s. The interplanetary magnetic field magnitude remained below 6 nT, and the Bz component fluctuated between -5 and 5 nT. The solar wind conditions are expected to continue to decline and return to nominal conditions.

Geomagnetic conditions were quiet to unsettle (local K Dourbes 1-3, NOAA Kp 2-3) due to the solar wind stream associated with the Coronal Hole. The conditions are expected to return to the nominal level as the solar wind is declining.

Estimation du nombre international de taches solaires (ISN) pour aujourd'hui : 010, sur la base de 10 stations.

Indices solaires pour 06 Dec 2017

Nombre de Wolf, observé par Catania	013
Flux solaire à 10 cm	068
AK Chambon La Forêt	019
AK Wingst	016
Ap estimé	017
Nombre international de taches solaires estimé	013 - Basé sur 13 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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