Affichage des archives de samedi, 12 décembre 2020

Bulletin quotidien sur l'activité solaire et géomagnétique du SIDC

Publié: 2020 Dec 12 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
12 Dec 2020	081	007
13 Dec 2020	082	007
14 Dec 2020	083	007

Bulletin

NOAA AR 2790 is the only visible active region on the solar disc, it did not produce any C-class flares or larger in the past 24 hours. A region (old AR 2783) is rotating into view from the east limb and producing several B-class flares. C-class flares are possible in the next 24 h.

A faint backsided full halo CME was seen first at 00:24 UT on 11 December by LASCO-C2, it will not affect the Earth. Another faint CME erupted from old NOAA AR 2791 (now decayed into a plage), first seen at 19:09 UT on 11 December by LASCO-C2. The CME is slow (about 200 km/s), with an angular width of around 60 degrees, and directed mostly towards the west. It will most likely not affect the Earth, but a glancing blow on 16 December cannot be discarded.

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 is expected to remain so in the next 24 hours. The 24h electron fluence was at moderate levels, it is expected to remain so in the next 24 hours

The solar wind speed ranged from 500 km/s to 400 km/s with interplanetary magnetic field magnitude around 5 nT, in the past 24 hours. The magnetic field polarity is negative, pointing towards the Sun. Bz was never below -5 nT.

Geomagnetic conditions were quiet to unsettled locally at Dourbes (K Dourbes 0-3) and quiet at planetary levels (Kp 0-2). Geomagnetic conditions are expected to remain quiet.

Estimation du nombre international de taches solaires (ISN) pour aujourd'hui : 007, sur la base de 03 stations.

Indices solaires pour 11 Dec 2020

Nombre de Wolf, observé par Catania	011
Flux solaire à 10 cm	083
AK Chambon La Forêt	011
AK Wingst	007
Ap estimé	006
Nombre international de taches solaires estimé	011 - Basé sur 08 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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