Affichage des archives de vendredi, 28 décembre 2018

Bulletin quotidien sur l'activité solaire et géomagnétique du SIDC

Publié: 2018 Dec 28 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
28 Dec 2018	069	016
29 Dec 2018	069	015
30 Dec 2018	069	010

Bulletin

Solar activity was at very low levels. The solar disk remained free of sunspots. No coronal mass ejections (CMEs) were observed over the last 24 hours. The greater than 10 MeV proton flux was at nominal values.

Solar activity is expected to remain at very low levels.

The co-rotating Interaction Region (CIR) and High Speed Stream (HSS) associated with the positive polarity coronal hole (CH) arrived earlier than expected. The CIR passed L1 (1st Lagrange point) around 19UT on 27 December, with Bz varying between -11 and +10 nT for the remainder of the period (DSCOVR). Solar wind speed gradually increased from values around 330 km/s to a maximum near 610 km/s at 10UT. The direction of the interplanetary magnetic field switched from towards the Sun to away from the Sun around 22UT. Kp was at active to minor storming levels (Kp = 4 to 5), whereas the local K index at Dourbes only reached unsettled conditions (K = 3). The Dst index reached a modest -8 nT at 03UT.

Quiet to active geomagnetic conditions are expected for the next two days as Earth remains under the influence of the CH HSS. A minor storming interval is not excluded. Geomagnetic conditions are expected to return to mostly quiet to unsettled levels from 30 December onwards.

Estimation du nombre international de taches solaires (ISN) pour aujourd'hui : 000, sur la base de 10 stations.

Indices solaires pour 27 Dec 2018

Nombre de Wolf, observé par Catania	000
Flux solaire à 10 cm	069
AK Chambon La Forêt	018
AK Wingst	004
Ap estimé	004
Nombre international de taches solaires estimé	000 - Basé sur 24 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

<< Aller à l'aperçu quotidien