Affichage des archives de mercredi, 20 septembre 2017

Bulletin quotidien sur l'activité solaire et géomagnétique du SIDC

Publié: 2017 Sep 20 1253 UTC

Prévisions SIDC

Éruptions solaires

Quiet conditions (<50% probability of C-class flares)

Géomagnétisme

Quiet (A<20 and K<4)

Moniteur de Flux de Proton

Quiet

	Flux de 10 cm	Ap
20 Sep 2017	073	007
21 Sep 2017	076	007
22 Sep 2017	079	007

Bulletin

Over the past 24 hours the solar activity was very low, only few B-class flares have been recorded. Catania sunspot group 55 (NOAA active region 2680) is unlikely to produce any flaring activity. The returning region (Catania sunspot group 49 / NOAA active region 2676) is currently on the East solar limb and is the source region of the B-class flares. We expect the solar activity to increase with B-class flares and a small probability of C-class flare coming from this returning region.

No Earth directed CMEs have been observed and the solar protons remained at background level in the past 24 hours.

The Earth is currently inside a slow (around 500 km/s) solar wind flow. The interplanetary magnetic field magnitude remained below 5 nT and the Bz component fluctuating between -4 and 4 nT. The solar wind is expected maintain its nominal conditions over the next days.

Geomagnetic conditions were quiet to unsettled (local K Dourbes 1-3, NOAA Kp 2-3) and are expected to remain quiet over the next days.

Estimation du nombre international de taches solaires (ISN) pour aujourd'hui : 017, sur la base de 20 stations.

Indices solaires pour 19 Sep 2017

Nombre de Wolf, observé par Catania	012
Flux solaire à 10 cm	071
AK Chambon La Forêt	017
AK Wingst	012
Ap estimé	009
Nombre international de taches solaires estimé	012 - Basé sur 32 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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