Affichage des archives de mardi, 8 décembre 2020

Bulletin quotidien sur l'activité solaire et géomagnétique du SIDC

Publié: 2020 Dec 08 1230 UTC

Prévisions SIDC

Éruptions solaires

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

Géomagnétisme

Minor storm expected (A>=30 or K=5)

Moniteur de Flux de Proton

Quiet

	Flux de 10 cm	Ap
08 Dec 2020	090	007
09 Dec 2020	090	013
10 Dec 2020	090	020

Bulletin

NOAA AR 2790 produced a long duration C7.4 flare, peaking at 16:32 UT on 7 December. The other region visible is NOAA AR 2791, both of alpha type. Further isolated C flaring is possible in the next 24 h.

A full halo CME was first seen by LASCO C2 at 16:24 UT on 7 December, with a speed of 1280 km/s, associated with the C7.4 flare. The bulk of the material was directed to the south, but it had an Earth directed component that is expected to arrive around 17:00 UT on 9 December and cause up to moderate storm conditions.

An equatorial coronal hole of negative polarity crossed the central meridian on 6 December, its associated high speed stream (HSS) is expected to arrive to the Earth on 9 December. It consists of several small coronal holes patches, it will probably not have a large impact.

The greater than 10 MeV proton flux is at background levels and is expected to remain at background levels. The greater than 2MeV electron flux did not exceed the 1000 pfu alert threshold, it may increase with the arrival of the HSS. The 24h electron fluence was at moderate levels, it may increase with the arrival of the HSS.

Solar wind speed was around 350 km/s and the interplanetary magnetic field mostly around 5 nT. Bz never went below -5 nT. The magnetic field phi angle has oriented away from the Sun (positive).

Geomagnetic conditions were quiet (local K Dourbes 0-2 and NOAA Kp 0-2). Geomagnetic conditions are expected to increase on 9 December due to the arrival of the HSS and the CME, active to moderate storm periods can be expected.

Estimation du nombre international de taches solaires (ISN) pour aujourd'hui : 011, sur la base de 10 stations.

Indices solaires pour 07 Dec 2020

Nombre de Wolf, observé par Catania	025
Flux solaire à 10 cm	090
AK Chambon La Forêt	005
AK Wingst	002
Ap estimé	001
Nombre international de taches solaires estimé	020 - Basé sur 15 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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