Affichage des archives de jeudi, 25 décembre 2014

Bulletin quotidien sur l'activité solaire et géomagnétique du SIDC

Publié: 2014 Dec 25 1214 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
25 Dec 2014	150	008
26 Dec 2014	140	019
27 Dec 2014	140	016

Bulletin

Solar activity once more was dominated by Catania sunspot region 38 (NOAA active region 2242), which currently has rounded the west limb. The main event was a long duration C4.0 flare, peaking at 5:23 UT on December 25. Coronagraphic imagery are not completely available yet to determine the characteristics of an accompanying CME, but from the first data it seems to be a weak westward CME. Additionally, C2.0 and C1.8 flares erupted from Catania 43 (NOAA 2245), positioned at N10E23. The C3.7 event from Catania 39 on December 24 was indeed associated with a CME, but the CME was too narrow, directed to the west and hence not geo-effective. A new unlabeled region has grown southeast of Catania 42 (near S12W25) and developed to a beta region. The > 10 MeV proton flux is still enhanced, but slowly returning back to the quiet situation. Flaring activity at the C-level is expected, with a minor chance for an isolated M-flare. The solar wind speed was relatively stable with values between 450 and 550 km/s. The magnitude of the interplanetary magnetic field reached values between 5 and 7 nT, with a fluctuating Bz component from -6 to +6 nT. Geomagnetic activity reached active levels at Dourbes (K=4). Quiet to unsettled geomagnetic conditions are expected for the next 24 hours. The arrival of a high speed stream from an elongated coronal hole (N15W25 to N55E05) that passed the central meridian, expected in the course of December 26 might trigger geomagnetic conditions to active levels.

Estimation du nombre international de taches solaires (ISN) pour aujourd'hui : 068, sur la base de 20 stations.

Indices solaires pour 24 Dec 2014

Nombre de Wolf, observé par Catania	///
Flux solaire à 10 cm	151
AK Chambon La Forêt	031
AK Wingst	022
Ap estimé	022
Nombre international de taches solaires estimé	068 - 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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