Affichage des archives de mercredi, 6 décembre 2017

Bulletin quotidien sur l'activité solaire et géomagnétique du SIDC

Publié: 2017 Dec 06 1231 UTC

Prévisions SIDC

Éruptions solaires

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

Géomagnétisme

Minor storm expected (A>=30 or K=5)

Moniteur de Flux de Proton

Quiet

	Flux de 10 cm	Ap
06 Dec 2017	070	018
07 Dec 2017	072	024
08 Dec 2017	073	014

Bulletin

The solar activity remained very quiet. No flare has been recorded in the past 24-hour. One bipolar sunspot (Catania sunspot group 65) has just emerged. Quiet flaring conditions are expected.

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 high speed solar wind stream (HSS) associated with the Coronal Hole (which has crossed the central meridian on Dec 01). The wind speed has continued to gradually increase from 550 to 630 km/s, and is currently showing a slight declining to 540 km/s. The interplanetary magnetic field magnitude showed a slow decline from 11 nT to the current value of 4 nT, and the Bz component fluctuated between -8 and 6 nT to return to its nominal values between -4 and 4 nT.

Disturbed geomagnetic conditions were observed due to the fast solar wind and the Bz component of the interplanetary magnetic field reaching -8 nT. A minor storm was observed by the local stations at Dourbes (K=5 from 15:00 to 17:00 UT on Dec 05), while NOAA reported Kp between 3 and 4. The high speed stream is expected to persist and new minor geomagnetic storms cannot be excluded, especially if Bz component remains negative for longer periods of time.

Estimation du nombre international de taches solaires (ISN) pour aujourd'hui : 012, sur la base de 08 stations.

Indices solaires pour 05 Dec 2017

Nombre de Wolf, observé par Catania	000
Flux solaire à 10 cm	068
AK Chambon La Forêt	047
AK Wingst	034
Ap estimé	034
Nombre international de taches solaires estimé	000 - Basé sur 17 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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