Affichage des archives de vendredi, 20 octobre 2017

Bulletin quotidien sur l'activité solaire et géomagnétique du SIDC

Publié: 2017 Oct 20 1230 UTC

Prévisions SIDC

Éruptions solaires

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

Géomagnétisme

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

Moniteur de Flux de Proton

Quiet

	Flux de 10 cm	Ap
20 Oct 2017	072	015
21 Oct 2017	074	016
22 Oct 2017	074	007

Bulletin

The Sun produced only two very low B flares in the past 24 hours. The probability for a C flare in the next 24 hours is estimated at 25%, mostly from returning NOAA region 2682 which is approaching the East limb. No Earth-directed Coronal Mass Ejections (CMEs) were observed in available coronagraphic imagery. The greater than 10 MeV proton flux was at nominal levels. Solar wind speed measured by DSCOVR increased from about 375 km/s to a maximum around 500 km/s near 21h UT on October 19, with current values around 450 km/s. The Interplanetary Magnetic Field (IMF) was predominantly directed away from the Sun and its magnitude ranged between about 3 and 11 nT. Bz was often below -5 nT between 12h and 18h UT on October 19, which is when solar wind speed was still in its ascending phase. This solar wind with elevated parameters probably originates from the (positive) north polar coronal hole. Quiet to active geomagnetic conditions (K Dourbes between 2 and 4; NOAA Kp between 2 and 4) were registered in the past 24 hours. Active geomagnetic levels (K Dourbes = 4) are possible on October 20 and 21. Quiet to unsettled geomagnetic levels (K Dourbes < 4) are expected on October 22.

Estimation du nombre international de taches solaires (ISN) pour aujourd'hui : 000, sur la base de 18 stations.

Indices solaires pour 19 Oct 2017

Nombre de Wolf, observé par Catania	000
Flux solaire à 10 cm	073
AK Chambon La Forêt	022
AK Wingst	014
Ap estimé	015
Nombre international de taches solaires estimé	000 - Basé sur 31 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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