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Bulletin quotidien sur l'activité solaire et géomagnétique du SIDC

Publié: 2015 Feb 20 1234 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

No forecast

	Flux de 10 cm	Ap
20 Feb 2015	125	007
21 Feb 2015	130	013
22 Feb 2015	140	017

Bulletin

Solar activity is gradually increasing to low levels, with two C1 flares originating from NOAA active region (AR) 2286. NOAA ARs 2287, 2288 and 2290 (Catania sunspot groups 88, 87 and 90 respectively) exhibited some growth. The strongest flare was a C1.6 flare, peaking at 10:25 UT on February 20. The C1.1 flare, peaking at 18:06 UT on February 19, was associated with a prominence eruption and a CME (first measurement in LASCO/C2 around 18 UT). The CME is mainly propagating to the southwest (not Earth-directed) and is too slow and too narrow to have any influence on Earth. The solar wind was at nominal levels, with the magnitude of the interplanetary magnetic field maximally at 6 nT. The solar wind speed is gradually decreasing with current values near 340 km/s. Geomagnetic conditions were quiet to unsettled (K=1 to 3) at the local level (Dourbes), which is expected to continue for the next 24 hours. Geomagnetic activity is expected to increase on February 22 to active levels due the influence of a high speed stream from a positive northern coronal hole.

Estimation du nombre international de taches solaires (ISN) pour aujourd'hui : 046, sur la base de 09 stations.

Indices solaires pour 19 Feb 2015

Nombre de Wolf, observé par Catania	///
Flux solaire à 10 cm	119
AK Chambon La Forêt	011
AK Wingst	012
Ap estimé	010
Nombre international de taches solaires estimé	061 - Basé sur 12 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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