Affichage des archives de samedi, 15 avril 2017

Bulletin quotidien sur l'activité solaire et géomagnétique du SIDC

Publié: 2017 Apr 15 1257 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
15 Apr 2017	073	009
16 Apr 2017	076	011
17 Apr 2017	078	014

Bulletin

Solar activity was at very low levels. The strongest event was a B1.2 flare peaking at 16:21 UT yesterday. No Earth-directed CMEs were observed in available coronagraph imagery. Integral proton flux for protons with energies above 10 MeV remained at background level. B-class flaring is expected today. C-class flaring is possible from tomorrow (April 16) due to anticipated return of old active region NOAA 2644 to the visible solar disk.

Solar wind speed declined from about 380 km/s to values around 340 km/s by the end of the reporting period. The interplanetary magnetic field gradually decreased from 7.7 nT to 3.8 nT. Bz fluctuated between -5 nT and +3 nT, being positive after 06UT. Geomagnetic conditions were ranged K Dourbes between 1 and 4; NOAA Kp between 1 and 3. Geomagnetic conditions are expected to be quiet to unsettled today (April 15) and tomorrow (April 16). Active to minor storm geomagnetic conditions can be expected on April 17 due to the onset of a large positive polarity CH HSS.

Estimation du nombre international de taches solaires (ISN) pour aujourd'hui : 000, sur la base de 09 stations.

Indices solaires pour 14 Apr 2017

Nombre de Wolf, observé par Catania	028
Flux solaire à 10 cm	073
AK Chambon La Forêt	022
AK Wingst	016
Ap estimé	016
Nombre international de taches solaires estimé	018 - Basé sur 23 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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