Affichage des archives de lundi, 24 septembre 2018

Bulletin quotidien sur l'activité solaire et géomagnétique du SIDC

Publié: 2018 Sep 24 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
24 Sep 2018	067	006
25 Sep 2018	067	007
26 Sep 2018	067	007

Bulletin

Solar activity was very low with X-ray flux remaining below B level and no spots on the visible disk. This is expected to remain so over the next days.

A filament erupted around noon September 23 from the North Eastern sector but no associated CME could be identified in coronagraph images.

Proton flux levels were at background values and are expected to remain so.

Solar wind remained slightly elevated with solar wind speed around 450 km/s. Initially, total magnetic field was elevated at 7.5-10nT with the phi angle indicating connection to negative polarity photospheric magnetic field and solar wind speed declining. But just before midnight a switch into negative polarity connection came associated with a dip in total magnetic field and a renewed slight increase of solar wind speed (reaching 480 km/s). Meanwhile the phi angle has switched back into the negative sector and solar wind is again declining (currently around 430 km/s). Solar wind speed is expected to remain slightly enhanced and may possible slightly increase under the influence of some patchy negative polarity open fields in the Southern hemisphere near the equator.

Geomagnetic conditions were quiet to unsettled (NOAA Kp 2-3 and local K Dourbes 1-3) and are expected to remain so.

Estimation du nombre international de taches solaires (ISN) pour aujourd'hui : 000, sur la base de 29 stations.

Indices solaires pour 23 Sep 2018

Nombre de Wolf, observé par Catania	///
Flux solaire à 10 cm	068
AK Chambon La Forêt	016
AK Wingst	012
Ap estimé	013
Nombre international de taches solaires estimé	000 - Basé sur 22 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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