Affichage des archives de lundi, 25 août 2014

Bulletin quotidien sur l'activité solaire et géomagnétique du SIDC

Publié: 2014 Aug 25 1250 UTC

Prévisions SIDC

Éruptions solaires

Active (M-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
25 Aug 2014	142	005
26 Aug 2014	142	014
27 Aug 2014	142	010

Bulletin

The Sun produced several C-class flares and one isolated M-class flare. The C-class flares mainly originated from NOAA AR 2149. A partial halo CME was visible in SOHO/LASCO C2 imagery with first measurement on August 24 at 12:36 UT. The CME was also visible in Stereo B/COR2 images from 13:24 UT onwards. The CME is associated with a M6 flare peaking at 12:17 UT and a type II radio burst (shock speed estimated at 593 km/s by the San Vito station). NOAA AR 2151 is identified to be source region. The CME is propagating in the eastern direction from the Sun- Earth line with a projected line-of-sight speed of 473 km/s (CACTus estimate). Due to the position of the source region, the CME is not expected to have an Earth-directed component. Two filament eruptions occurred; one centered at S30E35 on August 24 at 13:29 UT and one centered at N15W15 lifting off on August 25 at 7:09 UT. No associated CMEs were identified so far. Flaring activity is expected to continue with C-class flares and potentially an M-class flare. Solar wind speed has decreased till 260 km/s currently. The amplitude of the interplanetary magnetic field ranged from 0 to 6 nT, with a varying Bz component. The phi angle was mostly negative (toward), but changed to positive (away) at 11:00 UT. Geomagnetic conditions were quiet to unsettled and are expected to remain so until the combined arrival of the August 22 CME's. This may potentially result in active geomagnetic conditions from the afternoon of August 26 onwards.

Estimation du nombre international de taches solaires (ISN) pour aujourd'hui : 086, sur la base de 11 stations.

Indices solaires pour 24 Aug 2014

Nombre de Wolf, observé par Catania	///
Flux solaire à 10 cm	141
AK Chambon La Forêt	004
AK Wingst	003
Ap estimé	002
Nombre international de taches solaires estimé	104 - Basé sur 22 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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