Affichage des archives de vendredi, 15 septembre 2017

Bulletin quotidien sur l'activité solaire et géomagnétique du SIDC

Publié: 2017 Sep 15 1230 UTC

Prévisions SIDC

Éruptions solaires

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

Géomagnétisme

Minor storm expected (A>=30 or K=5)

Moniteur de Flux de Proton

Quiet

	Flux de 10 cm	Ap
15 Sep 2017	074	032
16 Sep 2017	073	015
17 Sep 2017	073	009

Bulletin

The sunspot group Catania number 55 (NOAA AR 2680), is still the only reported sunspot group on the visible side of the solar disc. Solar activity was very low, with no even C-class flares reported in the past 24 hours. Isolated C-class flares are possible in the coming hours, but very improbable. The particle event, associated with the X8.2 flare has finished, the proton fluxes with >10 MeV went bellow the event threshold at about 18 UT on September 14. No Earth directed CMEs have been observed in the past 24 hours.

The Earth is presently inside the fast solar wind stream with the speed of about 660 km/s. The interplanetary magnetic field magnitude is about 6 nT. Arrival of the interaction region between the slow and the fast solar wind from a low-latitude extension of the northern polar coronal hole induced yesterday afternoon and early this morning moderate geomagnetic storm conditions: NOAA Kp = 6 (with local K = 5 at Dourbes). The interaction region was followed by the fast stream, with the solar wind speed reaching 770 km/s. Since the solar wind speed is still rather high, longer intervals of the negative value of the Bz component of interplanetary magnetic field might still induce active to minor storm conditions. Geomagnetic conditions are presently active, and we expect active to possibly minor storm level (Kp up to 5) conditions in the coming hours.

Estimation du nombre international de taches solaires (ISN) pour aujourd'hui : 013, sur la base de 24 stations.

Indices solaires pour 14 Sep 2017

Nombre de Wolf, observé par Catania	012
Flux solaire à 10 cm	074
AK Chambon La Forêt	046
AK Wingst	029
Ap estimé	028
Nombre international de taches solaires estimé	013 - Basé sur 27 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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