Affichage des archives de samedi, 8 décembre 2018

Bulletin quotidien sur l'activité solaire et géomagnétique du SIDC

Publié: 2018 Dec 08 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
08 Dec 2018	071	012
09 Dec 2018	072	011
10 Dec 2018	073	010

Bulletin

The solar activity has been quiet over the past 24 hours. The bipolar sunspot group (Catania sunspot group 2, NOAA 2729) remained globally stable and did not produce any significant flare. A new region is visible on the East limb, but so far do not show any strong activity. Flaring conditions are expected to remain quiet with a very 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 environment is under the influence of the enhanced solar wind associated with the Coronal Hole (which reached the central meridian on December 04). The wind speed continued to gradually increase from about 425 km/s to reach the values around 570 km/s ; The interplanetary magnetic field strength fluctuated between 5 and 10 nT and the southward magnetic component between -7 and 6 nT being mainly positive. The enhanced solar wind conditions are expected to persist in the following days as long as Earth remains under the influence of the solar wind associated with the coronal hole.

The geomagnetic conditions were quiet to unsettled with short periods of active condition observed by the local station in Dourbes (K-Dourbs=4) on December 7, at 20:00 UT and 21:00 UT. The conditions are expected to remain the same in response to an enhanced interplanetary magnetic field, short periods of active condition are possible especially if there is a prolonged period of southward directed Bz component.

Estimation du nombre international de taches solaires (ISN) pour aujourd'hui : 000, sur la base de 09 stations.

Indices solaires pour 07 Dec 2018

Nombre de Wolf, observé par Catania	///
Flux solaire à 10 cm	///
AK Chambon La Forêt	///
AK Wingst	///
Ap estimé	///
Nombre international de taches solaires estimé	018 - Basé sur 16 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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