Affichage des archives de vendredi, 11 septembre 2015

Bulletin quotidien sur l'activité solaire et géomagnétique du SIDC

Publié: 2015 Sep 11 1230 UTC

Prévisions SIDC

Éruptions solaires

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

Géomagnétisme

Major magstorm expected (A>=50 or K>=6)

Moniteur de Flux de Proton

Quiet

	Flux de 10 cm	Ap
11 Sep 2015	086	030
12 Sep 2015	087	022
13 Sep 2015	089	017

Bulletin

Solar activity remains to be low, with no flares above the B-level reported during last 24 hours. We expect this low solar activity to persist with possibility of an isolated C-class flare in the coming hours. The flaring activity can be also expected from still unnumbered active region currently situated at the east solar limb. No Earth directed CMEs were observed in the last 24 hours.

The fast flow associated with the elongated equatorial coronal hole (20S to 20N) which crossed central meridian in the morning of September 08, has arrived this morning at about 06:40 UT. The solar wind speed has increased from about 450 km/s up to the current value of about 690 km/s. Simultaneously with the increase of the solar wind speed, the interplanetary magnetic field magnitude jumped to the value of about 20 nT (its present value is about 7 nT). The long interval of the negative value of the Bz component of the interplanetary magnetic field (down to -17nT) and the fast solar wind induced geomagnetic storm conditions, NOAA reported Kp=7 and local station Dourbes reported K=6. The fast flow from the low latitude extension of the northern polar coronal hole which crossed the central meridian in the morning of September 09 is expected to arrive at the Earth late today or morning of September 12. We expect active to geomagnetic storm conditions to persist in the coming hours.

Estimation du nombre international de taches solaires (ISN) pour aujourd'hui : 079, sur la base de 18 stations.

Indices solaires pour 10 Sep 2015

Nombre de Wolf, observé par Catania	045
Flux solaire à 10 cm	084
AK Chambon La Forêt	030
AK Wingst	019
Ap estimé	018
Nombre international de taches solaires estimé	043 - Basé sur 29 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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