Affichage des archives de mercredi, 18 décembre 2024

Bulletin quotidien sur l'activité solaire et géomagnétique du SIDC

Publié: 2024 Dec 18 1231 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
18 Dec 2024	170	007
19 Dec 2024	170	026
20 Dec 2024	170	016

Régions solaires actives et éruptions solaires

A total of 5 numbered sunspot groups were identified on the disk over the past 24 hours. Solar flaring activity was low over the past 24 hours, with only C-class flares identified. The largest flare was a C8.2 flare (SIDC Flare 3004) peaking at 07:34 UTC, from an AR rotating into view from the east limb.

Éjection de masse coronale

No Earth directed CMEs were observed in the last 24 hours. A backsided full halo CME was observed at 16:00 UTC on 17 December, it will not arrive to the Earth.

Vent solaire

The solar wind at Earth is still disturbed from the 17 December ICME arrival, with solar wind speeds around 650 km/s (SOHO CELIAS) and interplanetary magnetic field around 8 nT (DSCOVR). A slow return into solar wind conditions is expected for the next hours, and a possible arrival of one more ICME (corresponding to a CME from 15 December).

Géomagnétisme

Geomagnetic conditions have reached active levels both locally and globally (K_Bel and Kp up to 4). More disturbed geomagnetic conditions can be expected in the next 24 hours with the possible arrival of the 15 December CME.

Niveaux de flux de protons

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

Flux d'électrons sur l'orbite géostationnaire

The greater than 2 MeV electron flux measured by GOES 16 and GOES 18 remained below the threshold level in the last 24 hours. It is expected to remain so over the next 24 hours. The 24-hour electron fluence is presently at normal levels and is expected to remain so over the next 24 hours.

Estimation du nombre international de taches solaires (ISN) pour aujourd'hui : 116, sur la base de 10 stations.

Indices solaires pour 17 Dec 2024

Nombre de Wolf, observé par Catania	158
Flux solaire à 10 cm	170
AK Chambon La Forêt	037
AK Wingst	030
Ap estimé	027
Nombre international de taches solaires estimé	091 - Basé sur 13 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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