Affichage des archives de vendredi, 1 septembre 2017

Bulletin quotidien sur l'activité solaire et géomagnétique du SIDC

Publié: 2017 Sep 01 1243 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
01 Sep 2017	094	020
02 Sep 2017	094	021
03 Sep 2017	090	009

Bulletin

Over the past 24 hours solar activity remained low. A fourth sunspot region has emerged and did not show any signature of flaring activity. The other regions are relatively stable, Catania group 43 (NOAA region 2672) and Catania group 47 (NOAA region 2674) produced only B-class flares and narrow not earth-directed CMEs. We expect the solar activity to remain low with a probability of very few sporadic C-class flare.

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

Since yesterday, August 31 around 5:00 UT, the Earth is inside the fast solar wind with the speed ranging between 500 and 700 km/s. Over the past 24 hours, the interplanetary magnetic field magnitude remained below 11 nT with the Bz component fluctuating between -5 and 5 nT.

The geomagnetic conditions were active with a moderate storm (K-Dourbes=6, Kp-NOAA = 5) on August 31 around 10:00 UT, following shortly after by unsettled conditions (K-Dourbes=3) to even lower level (K-Dourbes=2) between September 1, 5:00 and 9:00 UT. Currently, K-Dourbes has raised to level 4. The geomagnetic conditions are expected to fluctuated between unsettled to active conditions for the next 48 h and until the high speed stream has finished. A CME was directed to the west and a glancing blow at the Earth on September 2 without important geomagnetic consequences is possible, although not likely. The faint and slow CME was observed on August 28 (first seen at 17:12 UT on LASCO-C2), originating from Catania group 43 (NOAA region 2672), which was located at 30 degrees west from central median.

Estimation du nombre international de taches solaires (ISN) pour aujourd'hui : 068, sur la base de 24 stations.

Indices solaires pour 31 Aug 2017

Nombre de Wolf, observé par Catania	071
Flux solaire à 10 cm	092
AK Chambon La Forêt	046
AK Wingst	027
Ap estimé	030
Nombre international de taches solaires estimé	/// - Basé sur /// 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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