Affichage des archives de samedi, 19 décembre 2020

Bulletin quotidien sur l'activité solaire et géomagnétique du SIDC

Publié: 2020 Dec 19 1231 UTC

Prévisions SIDC

Éruptions solaires

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

Géomagnétisme

Quiet (A<20 and K<4)

Moniteur de Flux de Proton

Quiet

	Flux de 10 cm	Ap
19 Dec 2020	083	007
20 Dec 2020	083	009
21 Dec 2020	083	004

Bulletin

NOAA AR 2793 has produced one low B flare in the past 24 hours, and has meanwhile decayed to a plage. The chance for a C flare in the next 24 hours is estimated at only 5%.

No Earth-directed Coronal Mass Ejections (CMEs) were observed in available coronagraphic 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 greater than 2 MeV electron flux was at nominal levels in the past 24 hours, and is expected to stay at nominal levels in the next 24 hours. The greater than 2 MeV electron fluence was at nominal levels during the past 24 hours, and is expected to remain so in the next 24 hours.

Solar wind speed near Earth as registered by DSCOVR has increased from about 290 to about 340 km/s in the past 24 hours. The orientation of the Interplanetary Magnetic Field (IMF) was predominantly positive (away from the Sun) and its magnitude varied between about 1 and 11 nT, with current values around 7 nT. Bz was never below -5 nT for an extended period. December 19, reaching a minimum of about -8 nT. Nominal solar wind conditions are expected in the next days, with a chance for slightly enhanced intervals.

Quiet geomagnetic conditions (K Dourbes between 0 and 2; NOAA Kp between 0 and 2) were registered in the past 24 hours. Quiet to unsettled geomagnetic levels (K Dourbes < 4) are expected on December 19, 20 and 21, with a slight chance for active intervals (K Dourbes = 4) on December 19 and December 20.

Estimation du nombre international de taches solaires (ISN) pour aujourd'hui : 000, sur la base de 11 stations.

Indices solaires pour 18 Dec 2020

Nombre de Wolf, observé par Catania	///
Flux solaire à 10 cm	082
AK Chambon La Forêt	005
AK Wingst	002
Ap estimé	002
Nombre international de taches solaires estimé	004 - 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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