Affichage des archives de samedi, 23 janvier 2016

Bulletin quotidien sur l'activité solaire et géomagnétique du SIDC

Publié: 2016 Jan 23 1231 UTC

Prévisions SIDC

Éruptions solaires

C-class flares expected, (probability >=50%)

Géomagnétisme

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

Moniteur de Flux de Proton

Quiet

	Flux de 10 cm	Ap
23 Jan 2016	101	014
24 Jan 2016	104	008
25 Jan 2016	107	010

Bulletin

Over the last 24 hours, flaring activity was restricted to the B-class level. NOAA 2486 and NOAA 2487 are further decaying, with the nearby 20 degrees long filament remaining stable. An active region (old NOAA 2481) is expected to start rotating over the southeast limb during the next period. This region was responsible for most of the (backside) coronal mass ejections (CME) observed in SOHO and Stereo-A coronagraphic imagery between 18:00UT and midnight on 22 January. No earth-directed CMEs were observed.

There remains a chance on an isolated C-class flare.

The geomagnetic field continued to be influenced by the high speed stream of the southern polar coronal hole (CH). Solar wind speed declined from an initial value around 500 km/s, to 470 km/s around 05:30UT, when it increased again to values near 600 km/s around 08:00UT and 10:30UT. Bz undulated between -7 nT and + 6 nT, while the interplanetary magnetic field was mostly directed towards the Sun. Mostly quiet to unsettled geomagnetic conditions were recorded, with Kp reaching active levels during the 06-09UT interval. The extension of a positive northern polar CH around +25 degrees latitude has transited the central meridian.

Mostly quiet to unsettled geomagnetic conditions are expected, with a chance on an active episode.

Estimation du nombre international de taches solaires (ISN) pour aujourd'hui : 058, sur la base de 10 stations.

Indices solaires pour 22 Jan 2016

Nombre de Wolf, observé par Catania	078
Flux solaire à 10 cm	101
AK Chambon La Forêt	020
AK Wingst	014
Ap estimé	016
Nombre international de taches solaires estimé	059 - Basé sur 15 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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