Affichage des archives de mardi, 23 mai 2017

Bulletin quotidien sur l'activité solaire et géomagnétique du SIDC

Publié: 2017 May 23 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
23 May 2017	076	008
24 May 2017	077	010
25 May 2017	078	011

Bulletin

Over the past 24 hours solar activity has been low. There has been one B1.5 flare peaking at 22:05 UT on 22-May-2017, coming from NOAA Active Region (AR) 2660 (McIntosh class:Hsx; Mag.Type:Alpha). NOAA AR 2658 (McIntosh class: Hsx; Mag.Type:Alpha) and AR 2659 (McIntosh class:Cro; Mag.Type:Beta) have shown some evidence of flux emergence and cancellation in HMI magnetogram observations, this may increase flaring activity. No Earth directed Coronal Mass Ejections (CMEs) have been detected. Integral proton flux for protons with energies above 10 MeV remained at background level. Solar activity is expected to remain low over the next 24 hours with a probability of C-class flares.

Solar wind speed increased from about 520 km/s to values around 620 km/s (20:00 UT on 22-May-2017) but then gradually decreased again till 520 km/s. The total interplanetary magnetic field (IMF) strength, as recorded by the DSCOVR satellite, was around 5 nT. Bz fluctuated between -5 and +5 nT the first half of the observational period later decreasing event further. Geomagnetic conditions were from unsettled to quiet in the past 24 hours (K Dourbes between 1 and 3; NOAA Kp between 1 and 3). Solar wind speed and interplanetary magnetic field variations are expected to decrease further today. In response geomagnetic conditions are likely to experience mostly quiet to unsettled conditions today and tomorrow.

Estimation du nombre international de taches solaires (ISN) pour aujourd'hui : 056, sur la base de 24 stations.

Indices solaires pour 22 May 2017

Nombre de Wolf, observé par Catania	070
Flux solaire à 10 cm	074
AK Chambon La Forêt	017
AK Wingst	014
Ap estimé	013
Nombre international de taches solaires estimé	050 - Basé sur 31 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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