Affichage des archives de dimanche, 4 janvier 2015

Bulletin quotidien sur l'activité solaire et géomagnétique du SIDC

Publié: 2015 Jan 04 1220 UTC

Prévisions SIDC

Éruptions solaires

Eruptive (C-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
04 Jan 2015	152	010
05 Jan 2015	155	018
06 Jan 2015	157	012

Bulletin

Only 6 low-level C-class flares were recorded, with the strongest event a C2.1 flare peaking at 04:52UT. All these flares had NOAA 2253 as their source, the only group that has been actively flaring during the last 24 hours. The negative polarity spot from yesterday's delta structure in NOAA 2253 has moved out of the region's positive polarity leading portion. No CME was associated to yesterday's isolated M-class flare. Some magnetic polarity mixing is present in the trailing portion of NOAA 2255. C-class flaring is expected, with a chance on an isolated M-class flare from NOAA 2253. The geomagnetic field was quiet to unsettled. Solar wind speed decreased from about 500 km/s around 09:30UT (03 January) to its current values just below 400 km/s. Bz was mostly positive till 20:00UT with values up to +8 nT, and steadily becoming negative after 02:00UT with values near -8 nT at the end of the period. In between, Bz was stable near slightly positive values. The influence of the high speed stream from the extension of the southern polar coronal hole is still expected for later today or tomorrow (05 January). The geomagnetic field is expected to be unsettled to active with a chance on a minor geomagnetic storm episode.

Estimation du nombre international de taches solaires (ISN) pour aujourd'hui : 074, sur la base de 13 stations.

Indices solaires pour 03 Jan 2015

Nombre de Wolf, observé par Catania	///
Flux solaire à 10 cm	149
AK Chambon La Forêt	012
AK Wingst	014
Ap estimé	015
Nombre international de taches solaires estimé	078 - Basé sur 10 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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