Affichage des archives de jeudi, 16 avril 2015

Bulletin quotidien sur l'activité solaire et géomagnétique du SIDC

Publié: 2015 Apr 16 1230 UTC

Prévisions SIDC

Éruptions solaires

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

Géomagnétisme

Active conditions expected (A>=20 or K=4)

Moniteur de Flux de Proton

Quiet

	Flux de 10 cm	Ap
16 Apr 2015	158	020
17 Apr 2015	163	008
18 Apr 2015	167	006

Bulletin

The strongest flare reported during last 24 hours was the C7.8 flare, peaking at 20:23 UT on April 15. The flare originated from, still the most complex region visible on the solar disc, NOAA AR 2321 (altogether Catania sunspot groups 29, 30 and 31). We expect C-class flares and possibly also an isolated M-class flare, in particular from NOAA ARs 2321, 2324, and 2325. No Earth directed CMEs were observed during last 24 hours. The Earth is inside the fast solar wind with the speed of about 620 km/s. The interplanetary magnetic field magnitude has decreased and its present value is about 7nT. During the last 24 hours the Bz component of the interplanetary magnetic field had a few longer intervals of negative value (mostly about - 6 nT, with minimum reported value of about -12nT) which induced minor storm geomagnetic conditions (local station at Dourbes and IZMIRAN reported K=5; NOAA reported Kp= 5). CME of April 12 might arrive at the Earth today. We expect active to possibly minor storm geomagnetic conditions in the coming hours.

Estimation du nombre international de taches solaires (ISN) pour aujourd'hui : 083, sur la base de 17 stations.

Indices solaires pour 15 Apr 2015

Nombre de Wolf, observé par Catania	125
Flux solaire à 10 cm	155
AK Chambon La Forêt	038
AK Wingst	033
Ap estimé	030
Nombre international de taches solaires estimé	073 - Basé sur 25 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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