Affichage des archives de mercredi, 27 septembre 2023

Bulletin quotidien sur l'activité solaire et géomagnétique du SIDC

Publié: 2023 Sep 27 1233 UTC

Prévisions SIDC

Éruptions solaires

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

Géomagnétisme

Active conditions expected (A>=20 or K=4)

Moniteur de Flux de Proton

Quiet

	Flux de 10 cm	Ap
27 Sep 2023	159	012
28 Sep 2023	159	011
29 Sep 2023	159	010

Régions solaires actives et éruptions solaires

Solar flaring activity over the past 24 hours was at low levels. The largest flare was a C4.7-flare, with peak time 05:46 UTC on September 27, produced by an as yet unnumbered region rotating over the south-east limb. There are currently 6 numbered active regions on the visible disk. NOAA AR 3435 (beta-delta) and NOAA AR 3445 (beta-gamma) are both mostly stable, NOAA AR 3449 (beta-gamma) has emerged in the north- east quadrant producing 4 C-class flares and NOAA AR 3448 has decayed into a plage region, all other regions have simple alpha or beta magnetic field configurations. The solar flaring activity is likely to remain at low levels over the coming days with C-class flares expected, M-class flares possible and a low chance for isolated X-class flaring.

Éjection de masse coronale

No Earth directed CMEs have been observed in the last 24 hours. Coronagraph data is still unavailable for the filament eruption reported on the 25 September. Any possible impact on Earth would consider to be minor.

Vent solaire

In the last 24 hours, the interplanetary magnetic field fluctuated between 1 nT and 8 nT and the Bz was mostly negative going down to – 5 nT. The solar wind speed increased on September 26 up to around 531 km/s and has gradually been decreasing since 23:20 UTC on September 26. The phi-angle has been switching between the positive sector (directed away from the Sun) and negative sector. Slow solar wind conditions are expected in the next 24 hours, with a possibility of a slight enhancement on the 28 September due to filament eruption on the 25 September.

Géomagnétisme

The geomagnetic conditions over the past 24 hours reached minor storm levels globally (Kp 5 +) and locally (K Bel 5) at the start of the period and decreased to quiet to active conditions by the end of the period. Quiet to active conditions are expected in the next 24 hours.

Niveaux de flux de protons

The greater than 10 MeV proton flux was at background level over the last 24 hours and is expected to remain so in the next 24 hours.

Flux d'électrons sur l'orbite géostationnaire

The greater than 2 MeV electron flux measured by GOES-16 stayed below threshold value. The greater than 2 MeV electron flux is expected to increase above the threshold in the next 24 hours. The 24h electron fluence became elevated but remained at nominal levels and is expected to remain at nominal levels in the next 24 hours.

Estimation du nombre international de taches solaires (ISN) pour aujourd'hui : 137, sur la base de 14 stations.

Indices solaires pour 26 Sep 2023

Nombre de Wolf, observé par Catania	143
Flux solaire à 10 cm	165
AK Chambon La Forêt	035
AK Wingst	024
Ap estimé	029
Nombre international de taches solaires estimé	151 - Basé sur 29 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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