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Bulletin quotidien sur l'activité solaire et géomagnétique du SIDC
Publié: 2025 Feb 21 1231 UTC
Prévisions SIDC
Éruptions solaires
M-class flares expected (probability >=50%)
Géomagnétisme
Quiet (A<20 and K<4)
Moniteur de Flux de Proton
Quiet
| Flux de 10 cm | Ap | |
|---|---|---|
| 21 Feb 2025 | 184 | 008 |
| 22 Feb 2025 | 184 | 007 |
| 23 Feb 2025 | 184 | 007 |
Régions solaires actives et éruptions solaires
A total of 8 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 C4.9 flare (SIDC Flare 3663) peaking on February 20 at 15:01 UTC, which was produced by SIDC Sunspot Group 405 (NOAA Active Region 3996). Solar flaring activity is expected to be moderate over the next 24 hours, with C-class flares expected and M-class flares likely.
Éjection de masse coronale
A wide CME erupting towards the west was seen on 20 February at 00:24 UTC (first seen by LASCO C2), related to a C8.1 flare and a type-II radio burst. The CME speed is estimated to be around 400 km/s, a glancing blow from this CME may be observed at Earth on 24 February. A filament erupted then in the SE quadrant, leading to a CME seen at 10:00 UT on 20 February, that is not expected to arrive to the Earth.
Vent solaire
The solar wind speed at Earth has decreased to 350 km/s in the last 24 hours, with an interplanetary magnetic field currently around 5 nT. Similar slow solar wind conditions can be expected for the next 24 hours.
Géomagnétisme
Geomagnetic conditions have been quiet to unsettled globally and locally (Kp and K_Bel up to 3). Similar conditions can be expected for 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 10 MeV GOES 16 and 18 electron flux has been below the threshold in the last 24 hours It is expected to remain below the threshold in the next 24 hours. The 24-hour electron fluence is currently at normal levels and is expected to remain so in the next 24 hours.
Estimation du nombre international de taches solaires (ISN) pour aujourd'hui : 160, sur la base de 13 stations.Indices solaires pour 20 Feb 2025
| Nombre de Wolf, observé par Catania | /// |
| Flux solaire à 10 cm | 184 |
| AK Chambon La Forêt | 009 |
| AK Wingst | 008 |
| Ap estimé | 006 |
| Nombre international de taches solaires estimé | 136 - Basé sur 11 stations |
Résumé des événements marquants
| Jour | Commencer | Max | Fin | Loc | Force | OP | 10cm | Catania/NOAA | Types de sursaut radio | |
|---|---|---|---|---|---|---|---|---|---|---|
| Aucun | ||||||||||
Données fournies par le Solar Influences Data analysis Center© - SIDC - Traité par SpaceWeatherLive
Toutes les heures sont indiquées en UTC
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| Dernière classe X | 08/12/2025 | X1.1 |
| Dernière classe M | 21/12/2025 | M1.3 |
| Dernier orage géomagnétique | 22/12/2025 | Kp5 (G1) |
| Jours sans taches solaires | |
|---|---|
| Dernier jour sans taches solaires | 08/06/2022 |
| Nombre mensuel moyen de taches solaires | |
|---|---|
| novembre 2025 | 91.8 -22.8 |
| décembre 2025 | 114.8 +23 |
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