Affichage des archives de jeudi, 6 septembre 2018

Bulletin quotidien sur l'activité solaire et géomagnétique du SIDC

Publié: 2018 Sep 06 1445 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
06 Sep 2018	067	009
07 Sep 2018	068	015
08 Sep 2018	068	010

Bulletin

Solar activity was at very low levels. The Sun was spotless again. No earth-directed coronal mass ejections (CMEs) were observed in the available coronagraphic imagery. The greater than 10 MeV proton flux was at nominal levels. A positive polarity coronal hole (CH) is approaching the Central Meridian.

Solar activity is expected to remain at very low levels.

Solar wind speed increased from an initial 490 km/s to a maximum of about 510 km/s around 13UT, before gradually declining to its current values just above 400 km/s (DSCOVR). Bz softened from -6 nT at the beginning of the period to a more stable range between -3 and +2 nT after 18UT. The direction of the interplanetary magnetic field was mostly in a positive sector (away from the Sun), with some negative excursions.

Quiet to unsettled geomagnetic conditions were observed, with K Dourbes recording an isolated active episode during the 10-13UT interval on 5 September. Quiet to active geomagnetic conditions are expected in response to the arrival later today or tomorrow (7 September) of the co-rotating interaction region (CIR) and wind stream from the negative polarity CH. A minor storming episode is not excluded.

Estimation du nombre international de taches solaires (ISN) pour aujourd'hui : 000, sur la base de 21 stations.

Indices solaires pour 05 Sep 2018

Nombre de Wolf, observé par Catania	000
Flux solaire à 10 cm	068
AK Chambon La Forêt	014
AK Wingst	014
Ap estimé	014
Nombre international de taches solaires estimé	000 - Basé sur 30 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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