Affichage des archives de samedi, 28 mai 2016

Bulletin quotidien sur l'activité solaire et géomagnétique du SIDC

Publié: 2016 May 28 1230 UTC

Prévisions SIDC

Éruptions solaires

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
28 May 2016	090	018
29 May 2016	091	018
30 May 2016	092	008

Bulletin

Three B-class flares were recorded over the period. The strongest event was a B4.6 flare peaking at 17:20UT (27 May) and produced by NOAA 2548. The trailing portion of this sunspot group decayed considerably. A B3.9 flare peaking at 16:45UT (27 May) was produced by an active region just behind the northeast limb. Small sunspot group Catania 83 (S15E30) produced the other B-class event at the end of the period (B3.5 peaking at 12:05UT). No earth-directed coronal mass ejections (CMEs) were observed.

There's a chance on an isolated C-class flare.

Earth remained under the influence of a coronal hole (CH) high speed stream (HSS). Solar wind speed increased from about 350 km/s near 16:00UT to values around 550 km/s near 07:00UT. The solar wind speed is currently fluctuating between 450 and 550 km/s. Bz oscillated mostly between -9 and +7 nT, with weakening amplitudes near the end of the period. The interplanetary magnetic field was mostly directed towards the Sun. Mostly quiet to unsettled geomagnetic conditions were observed, with an active episode during the 09UT-interval.

Quiet to active geomagnetic conditions are expected as Earth remains under the influence of the CH HSS. An intensification is expected with the arrival of the HSS from the northern CH later today or tomorrow. There's a small chance on an isolated minor storming episode.

Estimation du nombre international de taches solaires (ISN) pour aujourd'hui : 033, sur la base de 18 stations.

Indices solaires pour 27 May 2016

Nombre de Wolf, observé par Catania	044
Flux solaire à 10 cm	090
AK Chambon La Forêt	019
AK Wingst	015
Ap estimé	014
Nombre international de taches solaires estimé	032 - Basé sur 35 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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