Affichage des archives de mercredi, 20 décembre 2023

Bulletin quotidien sur l'activité solaire et géomagnétique du SIDC

Publié: 2023 Dec 20 1244 UTC

Prévisions SIDC

Éruptions solaires

C-class flares expected, (probability >=50%)

Géomagnétisme

Active conditions expected (A>=20 or K=4)

Moniteur de Flux de Proton

Quiet

	Flux de 10 cm	Ap
20 Dec 2023	181	015
21 Dec 2023	182	010
22 Dec 2023	183	015

Régions solaires actives et éruptions solaires

The solar flaring activity was at low levels with several C-class flares during the last 24 hours. The largest reported flare was GOES C8.3 flare, which peaked at 08:54 UT on Dec 20, from NOAA AR 3521. During the flare, the source region (AR 3521) of the flare had beta configuration of its photospheric magnetic field. The solar flaring activity is expected to be at low to moderate levels over the next 24 hours with few C-class flares, possibly M-class flares and a low chance for isolated X-class flares.

Éjection de masse coronale

No Earth-directed coronal mass ejections (CMEs) were detected in the available coronagraph observations during last 24 hour.

Trous coronaux

A negative polarity coronal hole has crossed the central meridian and a high-speed stream from this coronal hole may arrive to Earth from December 22.

Vent solaire

Earth continues to be under the influence of the fast solar wind. The solar wind speed decreased from 665 km/s to 475 km/s. The North- South component (Bz) ranged between -7 and 6 nT. The interplanetary magnetic field ranging from 1 nT to 8 nT. In the next 24 hours, we expect a gradual transition from fast to slow solar wind.

Géomagnétisme

Geomagnetic conditions were globally and locally at quiet to active conditions (NOAA Kp and K BEL 1 to 4), due to the continued impact of high speed streams from the positive polarity coronal hole which crossed the central meridian on Dec 17. The geomagnetic condition is expected to be quiet to active conditions probably in the next 24 hours.

Niveaux de flux de protons

The greater than 10 MeV proton flux was below the threshold level over the past 24 hours and is expected to remain so for the next 24 hours.

Flux d'électrons sur l'orbite géostationnaire

The 2 MeV electron flux, as measured by the GOES-16 satellite, was below the threshold level in the last 24 hours. It is expected that this parameter to remain below the threshold level in the next 24 hours. The 24h electron fluence continues to be at normal level and is expected to remain so.

Estimation du nombre international de taches solaires (ISN) pour aujourd'hui : 153, sur la base de 06 stations.

Indices solaires pour 19 Dec 2023

Nombre de Wolf, observé par Catania	231
Flux solaire à 10 cm	179
AK Chambon La Forêt	018
AK Wingst	012
Ap estimé	011
Nombre international de taches solaires estimé	174 - Basé sur 14 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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