Affichage des archives de jeudi, 15 février 2018

Bulletin quotidien sur l'activité solaire et géomagnétique du SIDC

Publié: 2018 Feb 15 1230 UTC

Prévisions SIDC

Éruptions solaires

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

Géomagnétisme

Active conditions expected (A>=20 or K=4)

Moniteur de Flux de Proton

Quiet

	Flux de 10 cm	Ap
15 Feb 2018	075	015
16 Feb 2018	074	012
17 Feb 2018	073	012

Bulletin

Over the past 24 hours solar activity has been low. No significant flares have been recorded. Active Region (AR) 2699 (Mcintosh class:Dso; Mag. type:Beta) has been most active, showing considerable flux emergence and cancellation. The greater than 10MeV proton flux remained at background levels over the past 24 hours. No Earth directed Coronal Mass Ejections (CMEs) have been detected. Over the next 24 hours there is a reasonable probability that flaring activity will reach C-class levels with a small probability of M-class flares. The solar wind speed fluctuated around 310 km/s over the past 24 hours, but jumped to 350 km /s this morning with the arrival of a shock front. The total magnetic field strength has remained around 3 nT, but began fluctuating between 3 and 9 nT in the last few hours. The Bz component has fluctuated between -3 and +3 nT. Geomagnetic conditions ranged between Kp index 0-2 (NOAA) and local K index 0-2 (Dourbes) over the past 24 hours. The above mentioned shock front arrived at 07:55 UT this morning. The sudden increase in the solar wind speed (from about 310 to 350 km/s) was observed simultaneously with an increase in the density, temperature and the interplanetary magnetic field magnitude (from about 2 nT to 7 nT). Since the solar wind speed was, and is still rather low, and the Bz component of the interplanetary magnetic field was mostly positive, the shock arrival did not induce disturbed geomagnetic conditions. The shock is probably related to the CME produced at 01:25 UT on 12-Feb-2018, which was anticipated to arrive at approximately 12:00 UT today. A large coronal hole that passed the central meridian a couple of days ago may also be the cause, however the associated High Speed Stream (HSS) is expected to arrive later today / tomorrow. Enhanced solar wind conditions from the coronal hole and CME arrival are expected to cause geomagnetic conditions to be unsettled.

Estimation du nombre international de taches solaires (ISN) pour aujourd'hui : 016, sur la base de 10 stations.

Indices solaires pour 14 Feb 2018

Nombre de Wolf, observé par Catania	///
Flux solaire à 10 cm	075
AK Chambon La Forêt	007
AK Wingst	003
Ap estimé	003
Nombre international de taches solaires estimé	023 - Basé sur 22 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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