Affichage des archives de mardi, 19 septembre 2017

Bulletin quotidien sur l'activité solaire et géomagnétique du SIDC

Publié: 2017 Sep 19 1231 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
19 Sep 2017	072	005
20 Sep 2017	073	006
21 Sep 2017	076	006

Bulletin

Over the past 24 hours the solar activity was very low with no flaring activity recorded. The Catania sunspot group 55 (NOAA active region 2680) is the only present region on the disc, and is unlikely to produce any flaring activity. We expect the solar activity to remain quiet until the returning region (Catania sunspot group 49 / NOAA active region 2676) will come from behind the East solar limb by the end of the day.

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

Solar wind speed starts a slow overall decline from about 700 km/s to 500 km/s. The interplanetary magnetic field magnitude returned to its nominal 3-6 nT range with the Bz component fluctuating between -4 and 4 nT. The solar wind is expected to further recover to nominal conditions over the next days.

Geomagnetic conditions were quiet to active (local K Dourbes 1-4, NOAA Kp 1-3) and are expected to remain quiet to unsettled over the next days.

Estimation du nombre international de taches solaires (ISN) pour aujourd'hui : 012, sur la base de 21 stations.

Indices solaires pour 18 Sep 2017

Nombre de Wolf, observé par Catania	013
Flux solaire à 10 cm	072
AK Chambon La Forêt	026
AK Wingst	021
Ap estimé	027
Nombre international de taches solaires estimé	014 - 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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