Affichage des archives de jeudi, 23 avril 2015

Bulletin quotidien sur l'activité solaire et géomagnétique du SIDC

Publié: 2015 Apr 23 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
23 Apr 2015	152	023
24 Apr 2015	152	016
25 Apr 2015	152	007

Bulletin

Solar flaring activity was mainly low but reached moderate levels with an M1.1 flare originating from Catania group 28 (NOAA 2322) from beyond the West limb peaking at 10:07 UT. Some further low level C flaring was observed from Catania groups 31 and 32 (NOAA 2326 and 2324 respectively). Most regions on disc appear mostly stable or in decay and not too remarkable. We expect C flaring over the next days. No Earth directed CME's were observed in the available coronagraph images. Solar wind conditions showed the decline of the positive polarity coronal hole high speed stream. Solar wind speed decreased from around 560 km/s at the start of the reporting period to around 440 km/s presently. Total magnetic field was around 4-5 nT with a short excursion up to 7 nT. Bz was variable remaining above -5nT. The magnetic field phi angle was stable in the outward sector. The were no clearly identifiable signs of the arrival of the April 18 CME. There remains a possibility for the CME to arrive later today or otherwise its effects have been covered up by the high speed stream effects. Geomagnetic conditions were quiet to unsettled with an isolated active period at planetary level (NOAA Kp 2-4, local K Dourbes 0-3). Solar wind is expected to further stabilize to nominal condition over the next days, but there remains a possibility for agitated conditions if the April 18 CME still arrives. Correspondingly, quiet to unsettled geomagnetic conditions are expected, with possibly active to minor storm conditions in case of CME arrival.

Estimation du nombre international de taches solaires (ISN) pour aujourd'hui : 087, sur la base de 22 stations.

Indices solaires pour 22 Apr 2015

Nombre de Wolf, observé par Catania	181
Flux solaire à 10 cm	150
AK Chambon La Forêt	018
AK Wingst	011
Ap estimé	012
Nombre international de taches solaires estimé	105 - Basé sur 29 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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