Affichage des archives de dimanche, 30 avril 2017

Bulletin quotidien sur l'activité solaire et géomagnétique du SIDC

Publié: 2017 Apr 30 1242 UTC

Prévisions SIDC

Éruptions solaires

Quiet conditions (<50% probability of C-class flares)

Géomagnétisme

Quiet (A<20 and K<4)

Moniteur de Flux de Proton

Quiet

	Flux de 10 cm	Ap
30 Apr 2017	076	008
01 May 2017	075	006
02 May 2017	074	006

Bulletin

Solar activity is very low and only one B-class flare was reported during last 24 hours. The long duration B3.0 flare (peaking at 00:57 UT on April 30) originated from the Catania sunspot group 18 (NOAA AR 2653). The flare was associated with the on disc CME signatures, EIT wave and coronal dimming. Presently available coronagraph images show that associated CME had angular width of about 90 degrees and as such it is not very probable that it will arrive at the Earth. No Earth directed CMEs have been observed and the solar protons remained at background level in the past 24 hours.

The Earth is presently inside the slow solar wind with the speed of about 390 km/s, and the interplanetary magnetic field magnitude has the value of about 3nT. The geomagnetic conditions are quiet and we expect them to remain so in the coming hours.

As we expect flaring activity to be below the C-class level, quiet geomagnetic conditions and no particle events, we will issue the all quiet alert.

Estimation du nombre international de taches solaires (ISN) pour aujourd'hui : 024, sur la base de 21 stations.

Indices solaires pour 29 Apr 2017

Nombre de Wolf, observé par Catania	///
Flux solaire à 10 cm	077
AK Chambon La Forêt	011
AK Wingst	008
Ap estimé	008
Nombre international de taches solaires estimé	034 - Basé sur 32 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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