Affichage des archives de samedi, 2 septembre 2017

Bulletin quotidien sur l'activité solaire et géomagnétique du SIDC

Publié: 2017 Sep 02 1235 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
02 Sep 2017	094	024
03 Sep 2017	093	012
04 Sep 2017	092	006

Bulletin

Over the past 24 hours solar activity remained low. There were four sunspot regions, and only Catania group 47 (NOAA region 2674) sowed some flaring activity and produced four C-class flares. The largest one was a C2.0-class flare with a peak-time at 15:37 UT September 1. Catania group 43 (NOAA region 2672) is on West solar limb and will disappear in a couple of hours. The photospheric magnetic complexity of Catania group 47 (NOAA region 2674) has increased, therefore we expect a higher probability of C-class flare with possibly the occurrence of an M-class flare. A new active region is turning over the East solar limb, which might start to also contribute the solar activity.

No Earth directed Coronal Mass Ejections (CMEs) have been detected in the available coronagraph imagery and the solar protons remains at background level.

The Earth remained in the fast solar wind with the speed that has slowly decreased from 700 to about 600 Km/s. The interplanetary magnetic field magnitude has also slowly decreased from 10 nT to about 4 nT, and the Bz component fluctuating between -5 and 2 nT.

The geomagnetic conditions were active with K-Dourbes ranging between 2 and 4, and Kp-NOAA between 2 and 5. The observed moderated storm (Kp-NOAA = 5) on September 2, between 03:00 and 09:00 UT was due to Bz component that stayed negative for a longer period. The geomagnetic conditions are expected to vary between unsettled to active conditions until the high speed stream has fade, and then to reduce to quiet to unsettled on September 3.

Estimation du nombre international de taches solaires (ISN) pour aujourd'hui : 063, sur la base de 22 stations.

Indices solaires pour 01 Sep 2017

Nombre de Wolf, observé par Catania	061
Flux solaire à 10 cm	093
AK Chambon La Forêt	030
AK Wingst	020
Ap estimé	020
Nombre international de taches solaires estimé	069 - 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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