Affichage des archives de jeudi, 26 janvier 2017

Bulletin quotidien sur l'activité solaire et géomagnétique du SIDC

Publié: 2017 Jan 26 1230 UTC

Prévisions SIDC

Éruptions solaires

Quiet conditions (<50% probability of C-class flares)

Géomagnétisme

Minor storm expected (A>=30 or K=5)

Moniteur de Flux de Proton

Quiet

	Flux de 10 cm	Ap
26 Jan 2017	084	008
27 Jan 2017	084	034
28 Jan 2017	083	018

Bulletin

Solar activity was very low. NOAA 2629 was responsible for the flurry of B-class flares observed, including a B8 flare peaking at 21:28UT - the strongest event of the period. A small filament eruption occurred in between NOAA 2628 and NOAA 2627 around 07:00UT. No earth-directed coronal mass ejections (CMEs) were observed in available coronagraphic imagery. The greater than 10MeV proton flux was at nominal levels.

Mostly quiet flaring conditions are expected, with a chance on a C-class event in particular from NOAA 2629.

Solar wind speed was steady between 360 and 330 km/s (DSCOVR) until 07:12UT when a small shock was observed in the solar wind. Wind speed suddenly increased from 335 km/s to values around 375 km/s. Density doubled from 8 to 16 particles per cm3, and magnetic field strength jumped from 6 to 10 nT. Bz fluctuated between -8 and +11 nT from 08UT onwards, ending the period at -8 nT. The interplanetary magnetic field was mostly directed away from the Sun. The origin of the small shock is currently being researched.

The geomagnetic field was at quiet to unsettled levels. It is expected to remain so until the arrival of the co-rotating interaction region (CIR) and associated high speed stream (HSS) from the equatorial coronal hole later today or tomorrow. This may result in active to minor storming episodes.

Estimation du nombre international de taches solaires (ISN) pour aujourd'hui : 038, sur la base de 14 stations.

Indices solaires pour 25 Jan 2017

Nombre de Wolf, observé par Catania	064
Flux solaire à 10 cm	085
AK Chambon La Forêt	005
AK Wingst	005
Ap estimé	004
Nombre international de taches solaires estimé	046 - 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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