Affichage des archives de lundi, 25 janvier 2016

Bulletin quotidien sur l'activité solaire et géomagnétique du SIDC

Publié: 2016 Jan 25 1239 UTC

Prévisions SIDC

Éruptions solaires

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 Jan 2016	104	004
26 Jan 2016	103	009
27 Jan 2016	104	007

Bulletin

Over the past 24 hours solar activity has been low. Several C-class flares have been detected. The most energetic flares were C1.4 class flares, produced by NOAA Active Region (AR) 2488. There is currently a large polar coronal hole rotating into the Western hemisphere which may increase geo-activity over the coming days. No Earth directed Coronal Mass Ejections (CMEs) have been detected. A currently unnamed region on the East solar limb produced a small CME around 12:00 UT yesterday (24-Jan-2016), the CME is not believed to be geo-effective. Solar activity is expected to remain low over the next 24 hours with the possibility of C-class flares, and the small region on the East limb producing further eruptions. The solar wind speed has been steadily decreasing over the past 24 hours from 500 km/s to 410 km/s. The total magnetic field strength remained around 5 nT. However, it peaked around 8 nT between 17:00 and 19:00 UT yesterday. The Bz has remained around 0 nT, but also fluctuated between 17:00 and 19:00 UT, reaching values of +5 and -5 nT. Geomagnetic conditions ranged between Kp index 1-4 (NOAA) and local K index 0-4 (Dourbes) over the past 24 hours, with activity peaking (Kp = 4; K =4) around 19:00 UT, coinciding with the fluctuating field. A low latitude section of a large polar coronal hole has rotated into the Western hemisphere and the resulting high-speed stream (HSS) may enhance solar wind speeds and increase geo-activity early tomorrow morning.

Estimation du nombre international de taches solaires (ISN) pour aujourd'hui : 064, sur la base de 19 stations.

Indices solaires pour 24 Jan 2016

Nombre de Wolf, observé par Catania	///
Flux solaire à 10 cm	104
AK Chambon La Forêt	013
AK Wingst	012
Ap estimé	011
Nombre international de taches solaires estimé	045 - 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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