Affichage des archives de mercredi, 13 janvier 2021

Bulletin quotidien sur l'activité solaire et géomagnétique du SIDC

Publié: 2021 Jan 13 1231 UTC

Prévisions SIDC

Éruptions solaires

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

Géomagnétisme

Quiet (A<20 and K<4)

Moniteur de Flux de Proton

Quiet

	Flux de 10 cm	Ap
13 Jan 2021	073	003
14 Jan 2021	074	002
15 Jan 2021	074	003

Bulletin

Solar activity was at very low levels on a spotless solar disk. No significant flares were detected in the last 24 hours and none are expected in the next 24 hours. No Earth-directed coronal mass ejections (CMEs) were detected in the available coronagraph imagery.

The greater than 10 MeV proton flux was at nominal levels in the past 24 hours and is expected to remain so in the next 24 hours. The greater than 2MeV electron flux remained under the 1000 pfu threshold and is expected to remain so. The 24h electron fluence was at nominal levels and is expected to remain so.

Over the past 24 hours the solar wind parameters (based on ACE and DSCOVR) showed a gradual decline due to the waning influence of the faster solar wind which arrived to Earth late on Jan 11th. The total magnetic field varied weakly between 2 nT and 5.5 nT and the north-south Bz component fluctuated in the range -4.8 nT to 5.5 nT. The phi angle remained in the positive sector reflecting the polarity of the coronal hole which currently affects the Earth. The solar wind speed is slowly decreasing towards background slow solar wind conditions with velocities in the range of 400 km/s to 480 km/s.

Quiet geomagnetic conditions were observed over the past 24 hours and quiet conditions are expected to prevail in the next 48 hours with a remaining possibility for isolated unsettled periods.

Estimation du nombre international de taches solaires (ISN) pour aujourd'hui : 000, sur la base de 14 stations.

Indices solaires pour 12 Jan 2021

Nombre de Wolf, observé par Catania	000
Flux solaire à 10 cm	073
AK Chambon La Forêt	009
AK Wingst	///
Ap estimé	011
Nombre international de taches solaires estimé	000 - Basé sur 19 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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