Affichage des archives de jeudi, 28 septembre 2023

Bulletin quotidien sur l'activité solaire et géomagnétique du SIDC

Publié: 2023 Sep 28 1231 UTC

Prévisions SIDC

Éruptions solaires

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

Géomagnétisme

Quiet (A<20 and K<4)

Moniteur de Flux de Proton

Quiet

	Flux de 10 cm	Ap
28 Sep 2023	152	010
29 Sep 2023	150	013
30 Sep 2023	150	011

Régions solaires actives et éruptions solaires

Solar flaring activity over the past 24 hours was at moderate levels. The largest flare was a M1.3-flare, with peak time 09:07 UTC on September 28. This flare was associated with NOAA AR 3450, which rotated over the eastern limb and has been the most active region in the last 24 hours. There are currently 7 numbered active regions on the visible disk. NOAA AR 3445 (beta) has decayed and NOAA AR 3449 (beta-gamma) has grown in size, all other regions have simple alpha or beta magnetic field configurations. The solar flaring activity is likely to be 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 CME’s have been detected in the last 24 hours. A CME was seen erupting towards the north-east in LASCO-C2 data from 11:12 UTC on September 27 this is determined to be back-sided and is not expected to impact the Earth.

Trous coronaux

A positive polarity coronal hole began passing the central meridian on September 27 in the northern hemisphere.

Vent solaire

In the last 24 hours, the interplanetary magnetic field fluctuated between 2 nT and 6 nT and the Bz fluctuated between positive and negative values going down to – 5 nT. The solar wind speed had values varied between 360 km/s and 535 km/s. The phi-angle was mainly in the positive sector (directed away from the Sun). Slow solar wind conditions are expected in the next 24 hours with a possibility of a slight enhancement on the 28 September due to a filament eruption on September 25.

Géomagnétisme

The geomagnetic conditions over the past 24 hours were unsettled globally (Kp 3) and locally (K Bel 3). Quiet to unsettled 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 went above the 1000 pfu threshold value between 12:00 UTC and 17:50 UTC on September 27. The greater than 2 MeV electron flux is expected to increase above the threshold again in the next 24 hours. The 24h electron fluence became elevated going towards moderate levels and is expected to remain at moderate levels in the next 24 hours.

Estimation du nombre international de taches solaires (ISN) pour aujourd'hui : 121, sur la base de 15 stations.

Indices solaires pour 27 Sep 2023

Nombre de Wolf, observé par Catania	168
Flux solaire à 10 cm	156
AK Chambon La Forêt	019
AK Wingst	016
Ap estimé	016
Nombre international de taches solaires estimé	142 - Basé sur 25 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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