Affichage des archives de vendredi, 25 janvier 2013

Bulletin quotidien sur l'activité solaire et géomagnétique du SIDC

Publié: 2013 Jan 25 1214 UTC

Prévisions SIDC

Éruptions solaires

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

Géomagnétisme

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

Moniteur de Flux de Proton

Quiet

	Flux de 10 cm	Ap
25 Jan 2013	103	005
26 Jan 2013	101	007
27 Jan 2013	098	013

Bulletin

The solar activity is very low, there were no C-class flares reported during last 5 days. The C-class flares are still possible but not very probable. A partial halo CME was detected by SOHO/LASCO on January 23. The CME was first observed in the SOHO/LASCO C2 field of view at about 14:00 UT, had angular width of about 240 degrees and projected speed around 500 km/s. It was associated with a prominence eruption and EIT wave, situated at that moment on the North-East quadrant of the Sun. It seems that the CME was directed somewhat northward of the Sun-Earth line. Therefore, we expect the arrival of only a CME-driven shock at the Earth, probably late on January 26 or early on January 27. It might result in active geomagnetic conditions. The solar wind speed is currently about 400 km/s and slowly increasing what is probably indication of the arrival of the fast solar wind stream from a low-latitude coronal hole in the southern hemisphere. The Bz component of the interplanetary magnetic field is fluctuating, with occasional intervals of negative values (up to -5 nT). We expect quiet to possibly active geomagnetic conditions in the next 24 hours.

Estimation du nombre international de taches solaires (ISN) pour aujourd'hui : 028, sur la base de 06 stations.

Indices solaires pour 24 Jan 2013

Nombre de Wolf, observé par Catania	061
Flux solaire à 10 cm	103
AK Chambon La Forêt	005
AK Wingst	001
Ap estimé	001
Nombre international de taches solaires estimé	039 - Basé sur 14 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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