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Tägliches Bulletin zur solaren und geomagnetischen Aktivität des SIDC

Ausgestellt: 2023 Apr 25 1231 UTC

Vorhersage des SIDC

Sonneneruptionen

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

Geomagnetismus

Quiet (A<20 and K<4)

Sonnenprotonen

Quiet

	10cm Fluss	Ap
25 Apr 2023	132	005
26 Apr 2023	130	002
27 Apr 2023	128	004

Bulletin

Solar flaring activity was low, with seven C-class flares detected during the last 24 hours. Three of those flares were emitted from NOAA Active Region (AR) 3283 (magnetic configuration Beta, Catania group 59) including the brightest, a C2 flare that peaked yesterday 13:05 UT. Two C1 flares were detected today from an AR at N20 currently rotating to Earth's view. A newly-emerged flux has appear SE of NOAA AR 3285 (magnetic configuration Beta, Catania group 65). More C-class flaring activity is expected, particularly from the AR region at N20E90 and the NOAA AR 3285 area.

A Coronal Mass Ejection (CME) detected automatically by CACTus yesterday 14:12 UT is directed southwards but has a chance of delivering a glancing blow at 27 or 28 Apr. A second CME also detected by CACTus yesterday 03:48 UT is not expected to be geo-effective as it is directed eastwards.

The greater than 10 MeV proton flux was at nominal levels over the past 24 hours and is expected to remain so for the next 24 hours. The greater than 2 MeV electron flux remained below the 1000 pfu alert threshold and is expected to remain below this threshold during the next 24 hours. The 24h electron fluence was at nominal levels and is expected to remain so.

The Solar Wind (SW) conditions are returning to a slow SW regime for the last 24 hours. The SW speed ranged between 490 and 600 km/s in the last 24 hours. The total interplanetary magnetic field (Bt) dropped steadily from 32 to 5 nT and its North-South component (Bz) followed the same trend in absolute value and now ranges between -5 and 5 nT. The interplanetary magnetic field phi angle was predominantly directed towards the Sun until today 03:00 UT and has now turned away from the Sun. The SW conditions will continue their return to a slow SW regime in the next 24 hours.

Geomagnetic conditions dropped from moderate to quiet globally (Kp 4- to 1+) and from active to quiet locally (K BEL 4 to 1) during the past 24 hours. Quiet conditions are expected to prevail in the next 24 hours, both globally and locally.

Die heute international geschätzte Sonnenfleckenanzahl (ISN): 086, basierend auf 18 Stationen.

Solarindizes für den 24 Apr 2023

Wolf-Zahl Catania	///
10cm Solarflux	134
AK Chambon La Forêt	033
AK Wingst	///
Geschätzer Ap-Wert	061
Geschätzte internationale Sonnenfleckenzahl	079 - Basierend auf 17 Stationen

Zusammenfassung auffälliger Ereignisse

Zur Verfügung gestellt vom Solar Influences Data Analysis Center© - SIDC - Verarbeitet von SpaceWeatherLive

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