Affichage des archives de jeudi, 18 avril 2013

Bulletin quotidien sur l'activité solaire et géomagnétique du SIDC

Publié: 2013 Apr 18 1152 UTC

Prévisions SIDC

Éruptions solaires

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

Géomagnétisme

Quiet (A<20 and K<4)

Moniteur de Flux de Proton

Quiet

	Flux de 10 cm	Ap
18 Apr 2013	105	003
19 Apr 2013	103	009
20 Apr 2013	100	011

Bulletin

Majority of the flaring activity during past 24 hours was of the low C-class level and originated from the Catania sunspot group 43 (NOAA AR 1719) which just turned behind the west solar limb. The strongest flare reported was C1.6 flare peaking at 08:19 UT today. The long duration C3.5 flare peaking at 21:32 UT on April 16 was associated with narrow CME which will not arrive at the Earth. The solar wind speed decreased to rather low value of about 280 km/s. The interplanetary magnetic field magnitude is stable and amounts about 3 nT . The fast flow from the small low-latitude coronal hole in the northern hemisphere which passed the central meridian on April 16 might arrive at the Earth late on April 19 or early on April 20. Although the arrival of the fast stream is possible it is not very probable, and we do not expect disturbed geomagnetic conditions due to its arrival. We expect quiet geomagnetic conditions in the next 48 hours.

Estimation du nombre international de taches solaires (ISN) pour aujourd'hui : 060, sur la base de 14 stations.

Indices solaires pour 17 Apr 2013

Nombre de Wolf, observé par Catania	112
Flux solaire à 10 cm	108
AK Chambon La Forêt	005
AK Wingst	003
Ap estimé	002
Nombre international de taches solaires estimé	067 - 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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