Affichage des archives de samedi, 28 mars 2026

Bulletin quotidien sur l'activité solaire et géomagnétique du SIDC

Publié: 2026 Mar 28 1233 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
28 Mar 2026	156	006
29 Mar 2026	154	006
30 Mar 2026	152	004

Régions solaires actives et éruptions solaires

Solar flaring activity was moderate over the past 24 hours, with an M1.3 (SIDC flare 7282), emitted on 28 Mar at 04:14 UTC. It is was associated with SIDC Sunspot Group (SG) 836 (NOAA Active Region [AR] 4405, Beta magnetic configuration). A small number of C-class flares was produced by SIDC SG 826 (NOAA AR 4400, Beta magnetic configuration), SIDC SG 830 (NOAA AR 4401, Beta-Gamma magnetic configuration), and SIDC SG 832 (NOAA AR 4403, Alpha magnetic configuration). Sporadic M-class flaring activity is likely in the next 24 hours, either from SIDC SG 836 or 830.

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 resemble the slow SW regime with the exception of the unusually low density. The SW speed registered values between 350 and 450 km/s and the density remained below 2 particles/cm3. The interplanetary magnetic field (B) ranged between 2 and 5 nT, and its North-South component (Bz) varied from -5 nT to 2 nT. Slow SW conditions are expected to continue in the next 24 hours.

Géomagnétisme

The geomagnetic conditions of the past 24 hours were both globally at quiet to unsettled levels (NOAA Kp 1+ to 3+) and locally quiet to active (K BEL 1 to 3 with the exception of K BEL 4 on 28 Mar at 00:00-03:00 UTC). In the next 24 hours both the global and local conditions are expected to be up to unsettled levels.

Niveaux de flux de protons

The greater than 10 MeV proton flux, as measured by the GOES-18 satellite, was at nominal levels over the past 24 hours and is likely to remain so. However, there is a small chance of a proton even in the next 24 hours.

Flux d'électrons sur l'orbite géostationnaire

During the past 24 hours, the greater than 2 MeV electron flux as measured by GOES 19, peaked at 13000 pfu on 27 Mar at 15:15 UTC and then dropped to below the 1000 pfu threshold at 20:35 UTC. A further drop is expected in the next 24 hours. The electron fluence was at moderate levels in the past 24 hours and is expected to remain at moderate levels in the next 24 hours.

Estimation du nombre international de taches solaires (ISN) pour aujourd'hui : 131, sur la base de 16 stations.

Indices solaires pour 27 Mar 2026

Nombre de Wolf, observé par Catania	170
Flux solaire à 10 cm	156
AK Chambon La Forêt	016
AK Wingst	008
Ap estimé	007
Nombre international de taches solaires estimé	140 - Basé sur 27 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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