Affichage des archives de mardi, 30 décembre 2014

Bulletin quotidien sur l'activité solaire et géomagnétique du SIDC

Publié: 2014 Dec 30 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
30 Dec 2014	131	021
31 Dec 2014	130	006
01 Jan 2015	129	007

Bulletin

There are currently 7 sunspot regions visible on the solar disk. Only two C-class flares were recorded. The strongest one was a C2 flare produced by NOAA 2251 peaking at 06:46UT. Some coronal dimming was noted, but no radio-burst has been reported so far. The flare also destabilized the nearby, 35-degrees long filament on the northern hemisphere. There are no coronagraphic images yet to assess any CME activity related to these events. Further C-class flaring is likely, in particular from NOAA 2250, NOAA 2251 and a new, as yet unnumbered region near the southeast limb. Minor geomagnetic storming (K=5) was observed during the last 24 hours in response to a high speed stream. After steadying around 540 km/s, solar wind speed picked up again after 16:00UT and gradually increased till maximum vallues near 750 km/s were reached around 03:00UT. After 05:00UT, the speed gradually decreased to a current value of 670 km/s. Bz fluctuated wildly between -11 and +11 nT from 15:00UT till 01:00UT, then gradually varied to a fluctuation between -5 and +4 nT. A gradual evolution to quiet and unsettled conditions is expected, though a brief active episode remains possible. The extension of a southern polar coronal hole is approaching the CM. During its previous passage, the high speed stream from this CH was responsible for minor geomagnetic storming. Similar conditions can be expected on 04-05 January.

Estimation du nombre international de taches solaires (ISN) pour aujourd'hui : 071, sur la base de 14 stations.

Indices solaires pour 29 Dec 2014

Nombre de Wolf, observé par Catania	///
Flux solaire à 10 cm	132
AK Chambon La Forêt	038
AK Wingst	025
Ap estimé	025
Nombre international de taches solaires estimé	068 - Basé sur 25 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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