Bulletins prévisionnels de la Météo Spatiale

Publié: 2026 Apr 28 0030 UTC
Préparés par le Département américain du Commerce, la NOAA, le Centre de Prévision de la Météo spatiale et traités par SpaceWeatherLive.com

Activité solaire

Résumé des dernières 24 heures

Solar activity was at moderate levels due to an M1.0/Sf flare at 27/0645 UTC from Region 4425 (N05E36, Ekc/beta-gamma-delta). Both Regions 4420 (N16W29, Fkc/beta-gamma-delta) and 4425 produced the majority of the C-class flares. Slight decay was observed in the intermediate spots of Region 4420 while maintaining a weak delta magnetic configuration. Moderate growth and consolidation occurred in Region 4425. Slight growth was observed in Region 4424 (N16E06, Dso/beta). The M6.0 flare yesterday at 26/2257 UTC had apparent ejecta observed in SUVI 304 imagery at 26/2326 UTC. A possibly associated CME was observed off the NW in SOHO/LASCO C2 imagery at 27/0636 UTC. Modelling indicated no Earth-directed component.

Prévisions

Solar activity is expected to be at low levels, with a high likelihood to reach moderate levels (R1/R2, Minor/Moderate), and a chance for X-class (R3/Strong or greater) events through 30 Apr, due primarily to the complexity of Regions 4420 and 4425.

Particules énergétiques

Résumé des dernières 24 heures

The greater than 2 MeV electron flux at geosynchronous orbit was at low to moderate levels. The greater than 10 MeV proton flux at geosynchronous orbit was at background levels.

Prévisions

The greater than 2 MeV electron flux is anticipated to reach moderate to high levels on 30 Apr due to CH HSS influence. There is a slight chance the greater than 10 MeV proton flux could reach S1 (Minor) levels on 28-30 Apr due to the flare potential of Regions 4420 and 4425.

Vent Solaire

Résumé des dernières 24 heures

Solar wind parameters were near nominal levels with solar wind speed ranging from 405-488 km/s. Total field ranged from 2-6 nT while the Bz component was between +5/-3 nT. Phi angle was variable.

Prévisions

Solar wind parameters are expected to be at or near nominal levels through midday on 29 Apr. An increase in activity is expected by mid to late on 29 Apr with the onset of a negative polarity CH HSS. HSS conditions are expected to persist through 30 Apr. Solar wind speeds in the 450-550 km/s range are likely.

Géospatial

Résumé des dernières 24 heures

The geomagnetic field was at quiet to unsettled levels.

Prévisions

The geomagnetic field is expected to be mostly quiet on 28 Apr. An increase to unsettled to active levels is expected on 29-30 Apr with the onset of a negative polarity CH HSS.