Affichage des archives de samedi, 13 mars 2021

Bulletin quotidien sur l'activité solaire et géomagnétique du SIDC

Publié: 2021 Mar 13 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
13 Mar 2021	076	026
14 Mar 2021	075	031
15 Mar 2021	075	019

Bulletin

NOAA active region 2808 (Catania groups 78 and 90) produced just a single B2.5 flare peaking at 19:04UT. Otherwise X-ray flux remained below B level. Active region NOAA 2809 decayed into plage, while region 2808 maintained its trailing spots but did not show any further significant growth. X-ray flux is expected to remain below C level.

No Earth-directed Coronal Mass Ejections (CMEs) have been observed in coronagraph data.

The greater than 10 MeV proton flux was at nominal levels over the past 24 hours and is expected to remain so for the next 24 hours. The greater than 2 MeV electron flux peaked briefly over the 1000 pfu event threshold before dipping to low values. The 24h electron fluence was at normal levels and is expected to be at low to normal levels today, before being expected to start a gradual increase due to the enhanced solar wind conditions.

The expected increase in Solar wind conditions (associated to the negative polarity coronal hole on the Southern hemisphere) is observed to be setting in. After reaching a minimum of 320 km/s early in the period Solar wind speed started to increase, now reaching just over 400 km/s. Total magnetic field reached up to 15nT and the Bz component reached Southward deviations up to -11nT. The interplanetary magnetic field was directed towards the Sun (as indicated by the phi angle). A further increase in Solar wind speed is expected over the next 24 hours up to possibly over 500 km/s. Magnetic field magnitude may remain enhanced initially but should start to decrease gradually as the Solar wind speed reaches its maximum.

Geomagnetic conditions have reached active levels (both NOAA Kp and local K Dourbes 2-4). Geomagnetic conditions are expected to see active periods in the next 24-48 hours before returning to quiet to unsettled conditions.

Estimation du nombre international de taches solaires (ISN) pour aujourd'hui : 011, sur la base de 17 stations.

Indices solaires pour 12 Mar 2021

Nombre de Wolf, observé par Catania	023
Flux solaire à 10 cm	077
AK Chambon La Forêt	028
AK Wingst	014
Ap estimé	014
Nombre international de taches solaires estimé	012 - Basé sur 24 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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