Affichage des archives de vendredi, 28 avril 2023

Bulletin quotidien sur l'activité solaire et géomagnétique du SIDC

Publié: 2023 Apr 28 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
28 Apr 2023	140	015
29 Apr 2023	138	011
30 Apr 2023	136	005

Bulletin

Solar flaring activity was low but frequent during the last 24 hours. Many C-class flares were detected, with the brightest being a C6 today at 01:22 from NOAA Active Region (AR) 3285 (magnetic configuration Beta, Catania group 65). The most flare-producing AR was NOAA 3288 (magnetic type Beta-Gamma-Delta, Catania group 67) with seven and NOAA 3285 with six C-class flares during the last 24 hours. NOAA AR 3285 and 3288 are expected to continue producing numerous C-class flares, while NOAA AR 3288 is capable of producing M-class flares in the next 24 hours.

A partial halo Coronal Mass Ejections (CME) can be seen in LASCO/C2 images starting from yesterday 01:25 UT and has a change to become geo-effective. If so it is estimated to arrive at 29 Apr. A partial halo CME automatically detected by CACTus at Apr 26 23:34 UT is a back-sided event.

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 was above the 1000 pfu threshold yesterday between 12:15-23:40 UT and for very short intervals from then on until today 04:50 UT. The 24-hour electron fluence was at moderate levels during the last 24 hours. In the next 24 hours hours the greater than 2 MeV electron flux is expected to follow a similar pattern, of several hours above the 1000 pfu threshold. The 24-hour electron fluence is expected to remain at moderate levels for the next 24 hours.

A negative polarity corona hole crossed the central meridian during the last 24 hours. However, because of its location high up in the northern hemisphere it is not expected to cause an impact on Earth's environment.

The Solar Wind (SW) conditions are still affected by the High Speed Stream (HSS) that arrived at 28 Apr. The SW speed remained between 550 km/s and 700 km/s. The total magnetic field (Bt) continue its gradual drop as it decreased from 8 nT to below 5 nT, while Its North-South (Bz) component fluctuated between -7 and 6 nT during the last 24 hours. The interplanetary magnetic field phi angle was predominantly directed towards the Sun over the last 24 hours, although since today 5:30 UT it shows signs of variation in direction. The effect of the HSS on the SW conditions is expected to slowly wane in the next 24 hours, yet the SW speed will most probably remain high.

Geomagnetic conditions were globally and locally active to moderate (NOAA Kp 4+ to 3- and K BEL 3-4) during the last 24 hours. They are expected to become moderate to quiet in the next 24 hours.

Estimation du nombre international de taches solaires (ISN) pour aujourd'hui : 113, sur la base de 08 stations.

Indices solaires pour 27 Apr 2023

Nombre de Wolf, observé par Catania	142
Flux solaire à 10 cm	141
AK Chambon La Forêt	///
AK Wingst	021
Ap estimé	022
Nombre international de taches solaires estimé	120 - Basé sur 21 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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