Affichage des archives de vendredi, 7 avril 2017

Bulletin quotidien sur l'activité solaire et géomagnétique du SIDC

Publié: 2017 Apr 07 1230 UTC

Prévisions SIDC

Éruptions solaires

C-class flares expected, (probability >=50%)

Géomagnétisme

Quiet (A<20 and K<4)

Moniteur de Flux de Proton

Quiet

	Flux de 10 cm	Ap
07 Apr 2017	072	008
08 Apr 2017	070	005
09 Apr 2017	072	009

Bulletin

Solar activity was at low levels during the period. Two C-class flares were recorded: a C5.5 flare at the very beginning of the period (12:10UT), and a C2.7 event peaking at 00:25UT. Both flares originated from NOAA 2645's trailing portion, which is now very close to the west limb. No earth-directed coronal mass ejections (CMEs) were observed in available coronagraphic imagery. The greater than 10MeV proton flux was at nominal levels.

C-class flaring remains possible, with a small chance on an isolated M-class flare.

Solar wind speed gradually decreased from an initial 490 km/s to 420 km/s by the end of the period. Bz fluctuated between -5 and +4 nT. The interplanetary magnetic field was mostly directed towards the Sun. The particle stream from a narrow extension from the positive polar coronal hole may affect the earth environment on 9 or 10 April.

The geomagnetic field was at quiet to unsettled levels and is expected to remain so, with only a small chance on an isolated active episode.

Estimation du nombre international de taches solaires (ISN) pour aujourd'hui : 027, sur la base de 16 stations.

Indices solaires pour 06 Apr 2017

Nombre de Wolf, observé par Catania	044
Flux solaire à 10 cm	076
AK Chambon La Forêt	014
AK Wingst	009
Ap estimé	008
Nombre international de taches solaires estimé	037 - Basé sur 27 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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