Affichage des archives de dimanche, 3 septembre 2017

Bulletin quotidien sur l'activité solaire et géomagnétique du SIDC

Publié: 2017 Sep 03 1236 UTC

Prévisions SIDC

Éruptions solaires

C-class flares expected, (probability >=50%)

Géomagnétisme

Quiet (A<20 and K<4)

Moniteur de Flux de Proton

Quiet

	Flux de 10 cm	Ap
03 Sep 2017	097	007
04 Sep 2017	096	006
05 Sep 2017	098	006

Bulletin

Over the past 24 hours solar activity remained low beside the number of regions with potential activity. The Catania group 47 (NOAA region 2674) produced several B and C-class flares. Although Catania group 43 (NOAA region 2672) had already rotated around the west solar limb, it produced the largest flare at 15:41 UT on September 2, which was a C7.7-class flare associated with a CME and a type II burst. The CME is not expected to be geoeffective as it erupted from the west solar limb. We expected a probability of C-class flare with possibly the occurrence of an M-class flare, particularly coming from the Catania group 47 (NOAA region 2674).

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. The speed has slowly decreased from 600 to about 500 Km/s. The interplanetary magnetic field magnitude stabilized around 4 nT, and the Bz component was fluctuating between -5 and 2 nT for the second day being mainly negative. No signature from the glancing glow CME (detected on August 28 at 17:12 UT on LASCO-C2) was observed in the Solar wind data. We expect the solar wind to gradually return to nominal levels by September 4.

The geomagnetic conditions varied between unsettled to quiet conditions with K-Dourbes and Kp-NOAA ranging between 1 and 3. As the solar speed is currently decreasing, we expect the geomagnetic conditions to return to quite condition.

Estimation du nombre international de taches solaires (ISN) pour aujourd'hui : 116, sur la base de 19 stations.

Indices solaires pour 02 Sep 2017

Nombre de Wolf, observé par Catania	///
Flux solaire à 10 cm	100
AK Chambon La Forêt	022
AK Wingst	022
Ap estimé	028
Nombre international de taches solaires estimé	062 - Basé sur 28 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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