Affichage des archives de jeudi, 30 novembre 2017

Bulletin quotidien sur l'activité solaire et géomagnétique du SIDC

Publié: 2017 Nov 30 1230 UTC

Prévisions SIDC

Éruptions solaires

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

Géomagnétisme

Active conditions expected (A>=20 or K=4)

Moniteur de Flux de Proton

Quiet

	Flux de 10 cm	Ap
30 Nov 2017	072	012
01 Dec 2017	071	008
02 Dec 2017	070	005

Bulletin

Solar activity was at very low levels. Decaying sunspot region NOAA 2689 was quiet and is approaching the NW limb. It has developed a filament in its spotless trailing section. The 40 degrees long filament is rounding the SW limb quietly. 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 slight chance on an isolated C-class flare.

Solar wind speed values around 400 km/s were recorded until about 19UT, when the wind stream associated with the southern polar coronal hole (CH) extension arrived and gradually drove the speed to values near 510 km/s around 09UT. Bz oscillated between +7 nT and -9 nT. The interplanetary magnetic field was mostly directed towards the Sun. Solar wind parameters did not show any obvious sign of the 25 November CME which has most likely missed the Earth.

The geomagnetic field was quiet to unsettled throughout the period, with Kp at active levels during the 03-06UT interval. Mostly quiet to unsettled conditions are expected, with a possibility on another active episode.

Estimation du nombre international de taches solaires (ISN) pour aujourd'hui : 011, sur la base de 09 stations.

Indices solaires pour 29 Nov 2017

Nombre de Wolf, observé par Catania	///
Flux solaire à 10 cm	073
AK Chambon La Forêt	015
AK Wingst	005
Ap estimé	004
Nombre international de taches solaires estimé	014 - Basé sur 20 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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