Affichage des archives de mercredi, 5 décembre 2018

Bulletin quotidien sur l'activité solaire et géomagnétique du SIDC

Publié: 2018 Dec 05 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
05 Dec 2018	069	005
06 Dec 2018	070	005
07 Dec 2018	071	019

Bulletin

The solar activity has been quiet over the past 24 hours. The visible solar disc was spotless, and no significant flare has been recorded. A new bipolar sunspot group (Catania sunspot group 2) has emerged today, no significant flare has been recorded. Flaring conditions are expected to increase with as small change of C-class flare.

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 solar wind measurements remained under the influence of the enhanced solar wind associated with the Coronal Hole (which reached the central meridian on November 27). The wind speed decreased to 415 km/s (December 4 around 13:00 UT), then re-increased and reached 500 km/s on December 4, around 19.00 UT. The interplanetary magnetic field strength fluctuated between 1.5 and 7 nT and the southward magnetic component between -4.8 and 5.2 nT. The solar wind parameters are expected to start to decrease to the slow solar wind regime. A large south polar coronal hole (of negative polarity) that extended up to latitude 10 degree North is currently facing Earth. The solar wind parameters are expected to be enhanced due to the fast solar wind associated with this coronal hole on the afternoon of December 7.

The geomagnetic conditions were quiet. The conditions are expected to be mainly quiet as the Earth is entering the slow solar wind speed regime. The geomagnetic conditions will then become more active due to the arrival of the fast solar wind.

Estimation du nombre international de taches solaires (ISN) pour aujourd'hui : 016, sur la base de 09 stations.

Indices solaires pour 04 Dec 2018

Nombre de Wolf, observé par Catania	///
Flux solaire à 10 cm	069
AK Chambon La Forêt	014
AK Wingst	///
Ap estimé	010
Nombre international de taches solaires estimé	000 - Basé sur 26 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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