Affichage des archives de jeudi, 20 juillet 2017

Bulletin quotidien sur l'activité solaire et géomagnétique du SIDC

Publié: 2017 Jul 20 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
20 Jul 2017	072	006
21 Jul 2017	071	016
22 Jul 2017	071	013

Bulletin

A C1.2 flare peaking at 00:02UT was recorded off the SouthWest Solar limb, apparently still related to NOAA region 2665, which is by now already well past the limb. With no spotted regions on disk the probability for C flares is very low over the next days. SDO/AIA 304 shows a filament eruption in the Southern hemisphere from 03:13UT onwards. There are no significant related signatures of this event in coronagraph data, and it is thus expected not to influence Earth. Proton flux levels are at background values and are expected to remain so.

Solar wind was nominal for most of the period with solar wind speed declining to values around 380 km/s and total magnetic field mostly under 4nT. The magnetic field phi angle switched back and forth three times as some expected sector boundary crossings occurred. The phi angle now indicates outward magnetic field orientation. Over the past hours, temperature as well as total magnetic field have been rising (to around 8nT presently) which could mark the first signs of the influence of the extension of the positive polarity northern polar coronal hole. Under the influence of the extension of the northern polar coronal hole solar wind speed may increase over the next few days. Geomagnetic conditions were quiet (local K Dourbes and NOAA Kp 1-2) and are expected to become quiet to unsettled with possibly some isolated active periods depending on the strength of the expected coronal hole influence.

Estimation du nombre international de taches solaires (ISN) pour aujourd'hui : 000, sur la base de 27 stations.

Indices solaires pour 19 Jul 2017

Nombre de Wolf, observé par Catania	000
Flux solaire à 10 cm	073
AK Chambon La Forêt	007
AK Wingst	004
Ap estimé	003
Nombre international de taches solaires estimé	000 - Basé sur 33 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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