Affichage des archives de jeudi, 20 décembre 2018

Bulletin quotidien sur l'activité solaire et géomagnétique du SIDC

Publié: 2018 Dec 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 Dec 2018	070	013
21 Dec 2018	070	004
22 Dec 2018	071	004

Bulletin

The Sun is spotless and did not produce any B class flares or higher in the past 24 hours. The chance for a C flare in the next 24 hours is estimated low. However, former region 2731 (N15W20) produced a couple of small dimmings at 12:00 UT yesterday. But, no associated Earth-directed CMEs were detected in available coronagraph imagery.

The greater than 10 MeV proton flux was at nominal levels in the past 24 hours, and is expected to stay at nominal levels in the next 24 hours.

The solar wind speed near Earth as registered by DSCOVR gradually increased from about 475 to 650 km/s in the past 24 hours, under the influence of a solar wind stream associated with an isolated negative polarity coronal hole. The Interplanetary Magnetic Field (IMF) was predominantly directed towards the Sun and varied between about 5 and 10 nT. Bz varied between 4 and -6 nT. The solar wind speed is expected to begin declining today.

Quiet to unsettled geomagnetic conditions (K Dourbes between 1 and 3; NOAA Kp between 1 and 3) were registered in the past 24 hours. There is a chance for active intervals (K Dourbes = 4) due to the enhanced solar wind speeds. Quiet to unsettled geomagnetic levels are expected over the next 24 hours.

Estimation du nombre international de taches solaires (ISN) pour aujourd'hui : 000, sur la base de 12 stations.

Indices solaires pour 19 Dec 2018

Nombre de Wolf, observé par Catania	///
Flux solaire à 10 cm	070
AK Chambon La Forêt	013
AK Wingst	006
Ap estimé	005
Nombre international de taches solaires estimé	000 - Basé sur 19 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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