Affichage des archives de jeudi, 5 octobre 2017

Bulletin quotidien sur l'activité solaire et géomagnétique du SIDC

Publié: 2017 Oct 05 1230 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
05 Oct 2017	086	009
06 Oct 2017	086	015
07 Oct 2017	084	010

Bulletin

Solar activity was at very low levels. The two visible sunspot groups, NOAA 2683 (Catania 57) and NOAA 2682 (Catania 56), produced 2 low- level B-class flares each. NOAA 2683 displayed a moderate size increase of some small opposite polarity sunspots south of the main spot, whereas NOAA 2682 still features a long filament to the east and north of the main spot. No earth-directed coronal mass ejections (CMEs) were observed in available coronagraphic imagery. The greater than 10 MeV proton flux was at nominal levels.

Quiet flaring conditions are expected, with a small chance on a C-class flare.

Solar wind speed varied between 360 and 380 km/s before 23UT, and between 380 and 410 km/s for the rest of the period (DSCOVR). Bz fluctuated between -6 and +7 nT, being predominantly positive after midnight. The interplanetary magnetic field was mostly directed towards the Sun.

The geomagnetic field was at quiet to unsettled levels, and is expected to remain so. The particle stream associated with a small negative equatorial coronal hole is still expected to arrive at Earth, late on 05 or on 06 October. This may increase the likelihood on an active geomagnetic episode.

Estimation du nombre international de taches solaires (ISN) pour aujourd'hui : 029, sur la base de 14 stations.

Indices solaires pour 04 Oct 2017

Nombre de Wolf, observé par Catania	///
Flux solaire à 10 cm	087
AK Chambon La Forêt	010
AK Wingst	007
Ap estimé	006
Nombre international de taches solaires estimé	028 - Basé sur 21 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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