Affichage des archives de mardi, 23 septembre 2014

Bulletin quotidien sur l'activité solaire et géomagnétique du SIDC

Publié: 2014 Sep 23 1239 UTC

Prévisions SIDC

Éruptions solaires

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

Géomagnétisme

Quiet (A<20 and K<4)

Moniteur de Flux de Proton

Quiet

	Flux de 10 cm	Ap
23 Sep 2014	134	012
24 Sep 2014	138	013
25 Sep 2014	142	012

Bulletin

Solar activity has been very low with only a single notable C flare peaking at 19:51 UT at C1.6 level and originating from NOAA AR 2172. Background X-ray radiation has steadily increased to the C level. All 6 active regions on disc appear stable with NOAA AR 2172 the most significant potential flaring source. C flares should be expected with a chance for an M-flare especially from this region. The slightly enhanced proton levels (below the event threshold) observed yesterday have meanwhile settled to almost nominal values. An at least partial halo CME was recorded in SOHO/LASCO C2 data starting at around 7:36 UT. Analysis is ongoing regarding its source and potential impact, but first analysis seems to point to a source on the far side similar to the second CME observed yesterday. Solar wind speed has been stable, mainly within the 400-460 km/s range. Total magnetic field has slightly increased from between 5-6 nT to between 6-7 nT with Bz variable but now predominantly negative up to -6nT. Geomagnetic conditions were quiet to unsettled (both NOAA Kp and local K Dourbes 2-3). Later today we may see the arrival of a coronal hole high speed stream likely to last over the coming days. Associated enhanced geomagnetic activity (periods of active conditions) is possible.

Estimation du nombre international de taches solaires (ISN) pour aujourd'hui : 089, sur la base de 16 stations.

Indices solaires pour 22 Sep 2014

Nombre de Wolf, observé par Catania	///
Flux solaire à 10 cm	130
AK Chambon La Forêt	016
AK Wingst	010
Ap estimé	009
Nombre international de taches solaires estimé	068 - Basé sur 23 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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