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Bulletin quotidien sur l'activité solaire et géomagnétique du SIDC

Publié: 2026 Apr 23 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
23 Apr 2026	120	008
24 Apr 2026	124	010
25 Apr 2026	128	013

Régions solaires actives et éruptions solaires

Solar flaring activity was moderate over the past 24 hours, with 2 M-class flares identified. A total of 5 numbered sunspot groups were identified on the disk over the past 24 hours. SIDC Sunspot Group 847 (NOAA Active Region 4420) has the most magnetically complex configuration (Beta-Gamma-Delta). The largest flare was a M1.6 flare (SIDC Flare 7456) peaking on April 23 at 04:35 UTC, which was produced by SIDC Sunspot Group 825 (NOAA Active Regions 4397, 4419), which produced most of the flaring activity in the last 24 hours. The second- largest flare was a M1.2 flare (SIDC Flare 7457) peaking on April 23 at 04:59 UTC produced by SIDC Sunspot Group 847 (NOAA Active Region 4420). Solar flaring activity is expected to be moderate over the next 24 hours, with M-class flares likely and a small chance for X-class flares.

Éjection de masse coronale

A Coronal Mass Ejection (CME) was observed LASCO-C2 data around 05:24 UTC on April 23. This CME is associated with M1.6 flare (SIDC Flare 7456) peaking on April 23 at 04:35 UTC, with a speed of around 800 km/s. A glancing blow arrival is expected on April 26 around 20:00 UTC.

Trous coronaux

SIDC Coronal Hole 157 (equatorial coronal hole extending to the polar south with a positive polarity) and SIDC Coronal Hole 156 (equatorial coronal hole with a positive polarity) are continuing to cross the central meridian.

Vent solaire

Slow solar wind conditions were recorded over the past 24 hours. The solar wind speed ranged between 432 km/s to 520 km /s. The total interplanetary magnetic field ranged from 3 to 6 nT, with the Bz reaching a minimum of -5 nT. The phi-angle was mainly in the negative sector (directed towards the Sun), with periods in the positive sector. Quite solar wind conditions are expected in the next 24 hours.

Géomagnétisme

The geomagnetic conditions were quiet to unsettles (Kp 1-3 & K BEL 1-3) in the last 24 hours. Quiet to unsettled conditions are expected over the next 24 hours.

Niveaux de flux de protons

The greater than 10 MeV GOES proton flux was at background levels and is expected to remain at background levels over the next 24 hours.

Flux d'électrons sur l'orbite géostationnaire

The greater than 2 MeV electron flux, as measured by GOES-18 and GOES-19 was above the 1000 pfu alert threshold in the past 24 hours. The flux is expected to fluctuate around the alert threshold over the next 24 hours. The 24-hour electron fluence was at 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 : 072, sur la base de 23 stations.

Indices solaires pour 22 Apr 2026

Nombre de Wolf, observé par Catania	///
Flux solaire à 10 cm	116
AK Chambon La Forêt	011
AK Wingst	006
Ap estimé	004
Nombre international de taches solaires estimé	077 - Basé sur 29 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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