Affichage des archives de mardi, 20 décembre 2016

Bulletin quotidien sur l'activité solaire et géomagnétique du SIDC

Publié: 2016 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 2016	073	005
21 Dec 2016	073	011
22 Dec 2016	074	006

Bulletin

Solar activity was very quiet in the past 24 hours. No flares were observed. The only numbered NOAA active region (AR) 2619 observed on visible side of the solar disk has simple magnetic configuration. Another small sunspot group, observed this morning (20-Dec-2016) by UCCLE-USET, Locarno and Kanzelhohe Observatories, by its high latitude (-23 degrees) and reverse polarity belongs to the next solar cycle 25. No Earth directed CMEs were observed. The large equatorial coronal hole with the low latitude extend that crossed central meridian yesterday afternoon (18-Dec-2016) is expected to disturb significantly the geospace environment from tomorrow evening (21-Dec-2016). Solar proton flux intensity is expected to lie within the background levels. Solar activity is expected to be low with some probability for B-class flares. Variations of the solar wind parameters were very low. Total Interplanetary Magnetic field (IMF) strength varied between 3 and 7 nT, while Bz varied between -3.5 and 3.5 nT. The solar wind speed decreased from 370 km/s till 340 km/s. Geomagnetic conditions were ranged from quiet to moderate (K Dourbes between 0 and 3; NOAA Kp between 1 and 2). The geomagnetic conditions are presently quiet to unsettled. We expect active conditions tomorrow evening (21-Dec-2016) due to expected arrival of the fast solar wind coming from the mentioned above large equatorial coronal hole.

Estimation du nombre international de taches solaires (ISN) pour aujourd'hui : 025, sur la base de 09 stations.

Indices solaires pour 19 Dec 2016

Nombre de Wolf, observé par Catania	///
Flux solaire à 10 cm	073
AK Chambon La Forêt	009
AK Wingst	006
Ap estimé	005
Nombre international de taches solaires estimé	021 - Basé sur 21 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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