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Bulletin quotidien sur l'activité solaire et géomagnétique du SIDC

Publié: 2025 Apr 25 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
25 Apr 2025	170	013
26 Apr 2025	172	016
27 Apr 2025	174	007

Régions solaires actives et éruptions solaires

A total of 15 numbered sunspot groups were identified on the disk over the past 24 hours. Only C-class flaring was observed in the last 24 hours. The largest one was a C3.0 flare (SIDC Flare 4197) peaking on April 25 at 04:05 UTC, which was produced by SIDC Sunspot Group 458 (NOAA Active Region 4045). Solar flaring activity is expected to be low over the next 24 hours, with C-class flares very likely and a chance for M-class flares.

Éjection de masse coronale

A filament erupted over the NW limb, leading to a CME first seen at 06:36 UTC on 24 April by LASCO C2, with an angular width around 70 degrees. This CME is not expected to arrive to the Earth. No Earth-directed CMEs were observed in the available coronagraph imagery in the last 24 hours.

Trous coronaux

There is a large positive polarity coronal hole (SIDC Coronal Hole 104) covering a large area of the southern hemisphere. There are two more, smaller, coronal holes in the northern hemisphere that crossed central meridian on 24 April.

Vent solaire

The solar wind speed has been around 500 km/s in the last 24 hours, with an interplanetary magnetic field around 6 nT, and Bz mostly positive. In the next 24 hours we may again see an increase in solar wind speed, due to the irregular shape of the SIDC Coronal Hole 104.

Géomagnétisme

Geomagnetic conditions have been quiet globally (Kp up to 2) and up to to unsettled levels locally (K_Bel up to 3). Unsettled to active conditions can be expected 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. 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 18 and 19 was below the threshold over the past 24 hours. The greater than 2 MeV electron flux may increase over the next 24 hours.The 24-hour electron fluence is presently at normal levels, it may increase over the next 24 hours.

Estimation du nombre international de taches solaires (ISN) pour aujourd'hui : 198, sur la base de 10 stations.

Indices solaires pour 24 Apr 2025

Nombre de Wolf, observé par Catania	196
Flux solaire à 10 cm	170
AK Chambon La Forêt	018
AK Wingst	014
Ap estimé	014
Nombre international de taches solaires estimé	200 - 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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