Affichage des archives de jeudi, 21 mai 2026

Bulletin quotidien sur l'activité solaire et géomagnétique du SIDC

Publié: 2026 May 21 1232 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
21 May 2026	114	006
22 May 2026	110	005
23 May 2026	108	004

Régions solaires actives et éruptions solaires

Solar flaring activity was very low over the past 24 hours. The X-ray flux was below C level. SIDC Sunspot Group 825 (NOAA Active Region 4436, Beta magnetic configuration) is currently rotating behind the west limb, however a large part of its flaring activity will continue to be detectable in the next 24 hours. Isolated C-class activity is likely during the next 24 hours.

Éjection de masse coronale

No Earth-directed Coronal Mass Ejections (CME) were observed in the last 24 hours.

Vent solaire

The Solar Wind (SW) conditions of the past 24 hours feature a slow SW regime. The SW speed ranged from 410 to 510 km/s, the interplanetary magnetic field (B) was up to 5 nT, and its North-South component (Bz) varied from -5 to 5 nT. The SW conditions are expected to remain at the current levels in the next 24 hours.

Géomagnétisme

The geomagnetic conditions of the past 24 hours reached unsettled levels both globally and locally (NOAA Kp 3 and K BEL 3) on 21 May from 00:00 to 03:00 UTC. The remaining time both global and local conditions were at quiet levels (NOAA Kp 1- to 2+ and K BEL 1 to 2). In the next 24 hours it is likely that they will continue at quiet levels.

Niveaux de flux de protons

The greater than 10 MeV proton flux, as measured by the GOES-19 satellite, was at nominal levels over the past 24 hours and is likely to remain so in the next 24 hours.

Flux d'électrons sur l'orbite géostationnaire

The greater than 2 MeV electron flux as, measured by GOES 19, was around the 1000 pfu alert threshold for past 24 hours. It reached a peak value of 1700 pfu on 20 May at 16:20 UTC. It is expected to marginally drop in the next 24 hours and possibly stay below the alert threshold. The electron fluence was at moderate levels in the past 24 hours and it is likely to drop to normal levels at some point in the next 24 hours.

Estimation du nombre international de taches solaires (ISN) pour aujourd'hui : 088, sur la base de 13 stations.

Indices solaires pour 20 May 2026

Nombre de Wolf, observé par Catania	086
Flux solaire à 10 cm	114
AK Chambon La Forêt	013
AK Wingst	010
Ap estimé	009
Nombre international de taches solaires estimé	072 - Basé sur 24 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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