Affichage des archives de jeudi, 27 décembre 2018

Bulletin quotidien sur l'activité solaire et géomagnétique du SIDC

Publié: 2018 Dec 27 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
27 Dec 2018	069	002
28 Dec 2018	069	010
29 Dec 2018	069	018

Bulletin

Solar activity was at very low levels. The Sun was spotless for the 12th consecutive day (SILSO). No coronal mass ejections (CMEs) were observed over the last 24 hours. The greater than 10 MeV proton flux was at nominal values. A narrow extension of the positive polarity northern polar coronal hole (CH) has transited the central meridian.

Solar activity is expected to remain at very low levels.

Solar wind speed showed a generally declining trend, from about 355 km/s at the beginning of the period to 315 km/s at the end (DSCOVR). Bz ranged from -4 to +4 nT. The interplanetary magnetic field remained chiefly directed towards the Sun (negative sector). Quiet geomagnetic conditions were observed.

Quiet geomagnetic conditions are expected to continue, until the arrival of the wind stream associated with the extension of the northern polar CH, currently expected for late on 28 or on 29 December. This may result in active geomagnetic conditions, a minor storming interval is not excluded.

Estimation du nombre international de taches solaires (ISN) pour aujourd'hui : 000, sur la base de 16 stations.

Indices solaires pour 26 Dec 2018

Nombre de Wolf, observé par Catania	///
Flux solaire à 10 cm	069
AK Chambon La Forêt	008
AK Wingst	002
Ap estimé	002
Nombre international de taches solaires estimé	000 - Basé sur 22 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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