Affichage des archives de jeudi, 5 février 2015

Bulletin quotidien sur l'activité solaire et géomagnétique du SIDC

Publié: 2015 Feb 05 1231 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
05 Feb 2015	145	006
06 Feb 2015	145	007
07 Feb 2015	149	007

Bulletin

Solar flaring activity was low. Most low class C-flares originated from NOAA AR 2277 (Catania groups 78, 79), with the largest event a C3.3 flare peaking at 9:53UT. Also Catania 82 (NOAA 2280) produced a C3 flare peaking at 19:12UT. Growth was observed in Catania 82 (NOAA 2280) as well as opposite polarity flux emergence in Catania 79 (the trailing part of NOAA 2277). Flaring is expected to continue at C level with just a minor chance for an isolated C flare from NOAA AR 2277 (Catania groups 78, 79). Two filament eruptions are clearly visible in SDO AIA304. A filament located north of Catania 82 (NOAA 2280) lifted off at 19:23UT followed by an eruption of a filament located east of Catania 79 around 23:09UT. Preliminary coronagraphic data show the first event to have resulted in an associated narrow northeast directed CME. We await more coronagrahic data for a proper assessment, especially concerning the second event. Solar wind speed continued to decrease continuously from around 470 km/s to about 410 km/s. The total magnetic field was initially stable around 3.5 nT becoming variable in the 0 to 5 nT range since later this morning. The Bz component was variable with downward excursions near -5 nT. Geomagnetic conditions were quiet to unsettled (both NOAA Kp and local KDourbes 1-3). Further stabilisation at nominal solar wind conditions is expected with consequent quiet to unsettled geomagnetic condition.

Estimation du nombre international de taches solaires (ISN) pour aujourd'hui : 068, sur la base de 09 stations.

Indices solaires pour 04 Feb 2015

Nombre de Wolf, observé par Catania	///
Flux solaire à 10 cm	145
AK Chambon La Forêt	018
AK Wingst	010
Ap estimé	009
Nombre international de taches solaires estimé	075 - Basé sur 17 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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