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Bulletin quotidien sur l'activité solaire et géomagnétique du SIDC

Publié: 2026 Apr 12 1231 UTC

Prévisions SIDC

Éruptions solaires

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

Géomagnétisme

Quiet (A<20 and K<4)

Moniteur de Flux de Proton

Quiet

	Flux de 10 cm	Ap
12 Apr 2026	096	017
13 Apr 2026	098	017
14 Apr 2026	098	024

Régions solaires actives et éruptions solaires

Solar flaring activity was low over the past 24 hours, with several C-class flares recorded. The largest flare was a C2.4 flare (SIDC Flare 7394), peaking at 05:08 UTC on April 12, associated with SIDC Sunspot Group 845 (NOAA Active Region 4417), a newly emerged and numbered active region near S06W74. There are currently three numbered active regions on the visible solar disk. The remaining active regions are relatively simple (magnetic type alpha or beta) and did not produce any significant flaring activity. Solar flaring activity is expected to be low over the next 24 hours, with C-class flares very likely and a small chance for M-class flares.

Éjection de masse coronale

No Earth-directed CMEs have been detected in the available coronagraph imagery over the past 24 hours.

Trous coronaux

A mid-latitude positive polarity coronal hole (SIDC Coronal Hole 159) in the southern hemisphere started to cross the central meridian from late on April 11.

Vent solaire

Over the past 24 hours, solar wind parameters (ACE and DSCOVR) reflected the waning influence of a high-speed stream (HSS). The solar wind speed decreased from about 600 km/s to 500 km/s. The interplanetary magnetic field remained weak, below 8 nT, and its north-south component (Bz) fluctuated between -4 nT and 4 nT. The magnetic field orientation was predominantly in the positive sector (field directed away from the Sun). Enhanced solar wind conditions, with a gradual return to the slow solar wind regime, can be expected over the next 24 hours, under the waning influence of the high-speed stream.

Géomagnétisme

Geomagnetic conditions were quiet both globally and locally over Belgium (Kp 1 to 2 and K-Bel 1 to 2). Mostly quiet to unsettled conditions are expected over the next 24 hours.

Niveaux de flux de protons

The greater than 10 MeV proton flux, as measured by GOES-18, was below the 10pfu 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 greater than 2 MeV electron flux, as measured by GOES-19, remained below the 1000 pfu alert threshold over the past 24 hours. The greater than 2 MeV electron flux, as measured by GOES-18, briefly exceeded the 1000 pfu alert threshold between 17:00 UTC and 23:20 UTC on April 11 and remained below the threshold for the rest of the period. It is expected to remain mostly below the alert threshold over the next 24 hours. The 24-hour electron fluence was at normal to moderate levels over the past 24 hours and is expected to remain at these levels over the next 24 hours.

Estimation du nombre international de taches solaires (ISN) pour aujourd'hui : 043, sur la base de 18 stations.

Indices solaires pour 11 Apr 2026

Nombre de Wolf, observé par Catania	///
Flux solaire à 10 cm	093
AK Chambon La Forêt	018
AK Wingst	013
Ap estimé	014
Nombre international de taches solaires estimé	044 - Basé sur 18 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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