Affichage des archives de mercredi, 24 mai 2017

Bulletin quotidien sur l'activité solaire et géomagnétique du SIDC

Publié: 2017 May 24 1311 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
24 May 2017	076	004
25 May 2017	075	007
26 May 2017	076	013

Bulletin

Over the past 24 hours solar activity has been low. There has been one B4.4 flare peaking at 14:21 UT on 23-May-2017, coming from NOAA Active Region (AR) 2660 (McIntosh class:Bxo; Mag.Type:Beta). There are three more decaying NOAA AR on the visible side of the solar disk. Slow partial halo CME, with projected speed of about 192 km/s and angular width of about 122 degree, was detected at 05:24 UT by CATUS on 23-May-2017. The PROBA2/SWAP images analysis indicates strong dimming near solar disk centre as the source of the CME. WSA-ENLIL model predicts the arrival of CME at Earth around noon on 26-May-2017. Integral electron flux for electrons with energies above 2 MeV reached high levels. Integral proton flux for protons with energies above 10 MeV remained at background level. The greater than 2 MeV electron flux is expected to reach high levels today and tomorrow (25-May-2017) in response to elevated solar wind speeds. Then return to the nominal level caused by particles redistribution can be expected on 26-May-2017 due to the possible CME arrival. Solar activity is expected to remain low over the next 24 hours with a probability of C-class flares. The solar wind speed decreased from about 520 km/s to values around 470 km/s during last 24 hours. The total interplanetary magnetic field (IMF) strength, as recorded by the DSCOVR satellite, was around 4 nT. Bz fluctuated between -3 and +3 nT being mostly negative. Geomagnetic conditions were ranged K Dourbes between 1 and 3; NOAA Kp between 1 and 2. The geomagnetic field is expected to be quiet today and tomorrow. Unsettled to active conditions are expected, with a minor storm possibility after noon 26-May-2017 due to the arrival of the 23-May-2017 CME.

Estimation du nombre international de taches solaires (ISN) pour aujourd'hui : 024, sur la base de 22 stations.

Indices solaires pour 23 May 2017

Nombre de Wolf, observé par Catania	067
Flux solaire à 10 cm	076
AK Chambon La Forêt	014
AK Wingst	010
Ap estimé	009
Nombre international de taches solaires estimé	057 - 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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