Affichage des archives de jeudi, 30 avril 2015

Bulletin quotidien sur l'activité solaire et géomagnétique du SIDC

Publié: 2015 Apr 30 1230 UTC

Prévisions SIDC

Éruptions solaires

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

Géomagnétisme

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

Moniteur de Flux de Proton

Quiet

	Flux de 10 cm	Ap
30 Apr 2015	106	017
01 May 2015	110	008
02 May 2015	114	008

Bulletin

The solar disk currently is almost spotless. One single C1.0 flare occurred at the southwest limb. A faint CME was visible, with first measurement in SOHO/LASCO-C2 at 2:24 UT on April 30, related to backside activity and propagating north. There is some chance (40%) for further C-class flares. Solar wind observations indicate the arrival of a flow related to a positive polarity coronal hole. Around 4:00 UT on April 30, temperature and solar wind speed increased (currently at 370 km/s), while the magnitude of the Interplanetary Magnetic Field (IMF) became more variable and increased to 12 nT. The south component of the IMF is fluctuating between -6 and +8nT. Quiet to unsettled (local K=0 to 3 at Dourbes) geomagnetic conditions were observed. Mainly quiet geomagnetic conditions are expected, with some chance for a few time slots of active (K=4) to minor storm (K=5) conditions within the next 24 hours. Another flow emanating from the extension of a negative polarity northern coronal hole could arrive on May 2.

Estimation du nombre international de taches solaires (ISN) pour aujourd'hui : 011, sur la base de 23 stations.

Indices solaires pour 29 Apr 2015

Nombre de Wolf, observé par Catania	036
Flux solaire à 10 cm	104
AK Chambon La Forêt	011
AK Wingst	004
Ap estimé	003
Nombre international de taches solaires estimé	020 - Basé sur 26 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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