Affichage des archives de vendredi, 11 mai 2018

Bulletin quotidien sur l'activité solaire et géomagnétique du SIDC

Publié: 2018 May 11 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
11 May 2018	070	009
12 May 2018	070	003
13 May 2018	069	003

Bulletin

Solar activity was at very low levels. Small and inactive region NOAA 2709 (Catania 81) remained the only visible sunspot region on the solar disk. No earth-directed coronal mass ejections (CMEs) were observed in available coronagraphic imagery. The greater than 10 MeV proton flux was at nominal levels.

Solar activity is expected to remain at very low levels.

Earth remained under the influence of the high speed stream (HSS) from an elongated negative polarity equatorial coronal hole (CH). Solar wind speed decreased from about 570 km/s to values near 460 km/s by the end of the period (DSCOVR). Bz varied between -5 and +2 nT, with a negative stretch during the 03-09UT interval and Bz dipping to -5.5 nT. The interplanetary magnetic field was mostly directed towards the Sun. Geomagnetic activity ranged from quiet to active levels.

Quiet to unsettled geomagnetic conditions are expected in response to Earth's gradual exit from the CH HSS. There remains a small chance on an isolated active interval.

Estimation du nombre international de taches solaires (ISN) pour aujourd'hui : 011, sur la base de 21 stations.

Indices solaires pour 10 May 2018

Nombre de Wolf, observé par Catania	011
Flux solaire à 10 cm	070
AK Chambon La Forêt	018
AK Wingst	014
Ap estimé	014
Nombre international de taches solaires estimé	012 - 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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