Affichage des archives de mercredi, 26 octobre 2016

Bulletin quotidien sur l'activité solaire et géomagnétique du SIDC

Publié: 2016 Oct 26 1230 UTC

Prévisions SIDC

Éruptions solaires

Quiet conditions (<50% probability of C-class flares)

Géomagnétisme

Major magstorm expected (A>=50 or K>=6)

Moniteur de Flux de Proton

Quiet

	Flux de 10 cm	Ap
26 Oct 2016	078	041
27 Oct 2016	077	034
28 Oct 2016	076	026

Bulletin

NOAA 2603 produced the strongest event of the period, a B1.9 peaking at 20:42UT. This region has now a mature but small trailing spot, and seems to have simplified magnetically. A strong coronal mass ejection (CME) over the northeast solar limb was observed in LASCO/C2 starting 25 October around 19:00UT. Its source was located on the farside of the Sun (old active region NOAA 2599). No earth-directed CMEs were observed.

Quiet flaring conditions are expected to continue, with a small chance on an isolated C-class flare.

Earth was under the influence of the high speed stream (HSS) from the huge coronal hole (CH). Maximum solar wind speeds near 830 km/s were recorded around 23UT on 25 October (DSCOVR), its current values now fluctuating between 670 and 750 km/s. Bz varied between -15 and +9 nT during the first half of the period, but is currently fluctuating between -6 and +6 nT. The interplanetary magnetic field (IMF) was directed away from the Sun (positive). Kp ranged from active to major geomagnetic storming, while K Dourbes ranged from quiet conditions to moderate storming.

Wind speeds are expected to remain above 500 km/s for the next two days, with periods of sustained negative Bz possible. Hence, mostly unsettled to moderate storm conditions are expected, with a small chance on another major storming interval (K-index = 7).

Estimation du nombre international de taches solaires (ISN) pour aujourd'hui : 029, sur la base de 17 stations.

Indices solaires pour 25 Oct 2016

Nombre de Wolf, observé par Catania	///
Flux solaire à 10 cm	///
AK Chambon La Forêt	///
AK Wingst	062
Ap estimé	055
Nombre international de taches solaires estimé	018 - Basé sur 20 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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