Affichage des archives de jeudi, 19 novembre 2020

Bulletin quotidien sur l'activité solaire et géomagnétique du SIDC

Publié: 2020 Nov 19 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
19 Nov 2020	077	009
20 Nov 2020	077	014
21 Nov 2020	077	008

Bulletin

Solar activity remained at very low levels. The only active region NOAA 2783 (Hsx/alpha) observed on the solar disk around S23E48 was quiet and did not produce any flaring above B class in the last 24 hours. The solar activity is expected to remain very low with slight changes for a C class flare. No Earth-directed coronal mass ejections (CMEs) were detected in the available coronagraph imagery. A filament has formed on the solar disk to the west from active region NOAA 2783. Its evolution will be monitored.

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 2 MeV 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 for the next 24 hours.

Solar wind speed remained very slow with fluctuating around 300 km/s (ACE and DSCOVR). The total magnetic field was very weak with a maximal strength of 6.3 nT. The Bz component varied between -4 nT and +3 nT. The phi angle remained predominantly in the positive sector.

Geomagnetic activity was globally quiet with locally unsettled conditions since 9 UT this morning. The geomagnetic activity is expected to remain quiet to unsettled within the next 24 hours and unsettled to active conditions after with the possible arrival of an enhanced solar wind stream related to the positive polarity coronal hole CH 97.

Estimation du nombre international de taches solaires (ISN) pour aujourd'hui : 010, sur la base de 13 stations.

Indices solaires pour 18 Nov 2020

Nombre de Wolf, observé par Catania	012
Flux solaire à 10 cm	077
AK Chambon La Forêt	005
AK Wingst	004
Ap estimé	002
Nombre international de taches solaires estimé	010 - Basé sur 34 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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