Affichage des archives de dimanche, 17 septembre 2023

Bulletin quotidien sur l'activité solaire et géomagnétique du SIDC

Publié: 2023 Sep 17 1304 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

Warning condition (activity levels expected to increase, but no numeric forecast given)

	Flux de 10 cm	Ap
17 Sep 2023	140	015
18 Sep 2023	138	005
19 Sep 2023	136	021

Régions solaires actives et éruptions solaires

Solar flaring activity was at low levels in the past 24 hours with background low C-class flaring. The strongest activity was a C3.7-class flare produced by active region NOAA AR 3429 (beta-gamma), which is the most complex region on the visible solar disc and is responsible for most of the flaring activity. Isolated low C-class flaring was produced by NOAA 3435 (beta), which has rotated into view from the east limb, as well as from a region behind the south-east limb. The remaining four active regions are relatively simple and have either shown some decay or remained stable and inactive. The solar flaring activity is expected to be at low levels over the coming days with likely C-class flares and low chances for isolated M-class flaring.

Éjection de masse coronale

The halo coronal mass ejection (CME) related to the large filament eruption near the disc centre on Sept 16th, which was first observed by SOHO/LASCO-C2 at 09:12 UTC has now been analysed. While the bulk of the CME travels westward, a flank/glancing blow is expected to reach Earth on Sept 19th. No new Earth-directed CMEs have been detected in the available coronagraph imagery.

Trous coronaux

A small mid-latitude negative polarity coronal hole has crossed the central meridian in the UTC afternoon of Sept 16th and could cause some enhanced solar wind conditions at Earth earliest on Sept 19th.

Vent solaire

Over the past 24 hours the solar wind parameters (ACE and DSCOVR) have registered minor enhancements possibly due to an expected high speed stream arrival travelling in the perturbed solar wind conditions from the nearby passage of the Sept 14th CME. The solar wind velocity has reached 500 km/s. The interplanetary magnetic field reached 11.3 nT with a minimum Bz of -8.7 nT. The B field was highly fluctuating, remaining predominantly in the negative sector (directed towards the Sun). The solar wind conditions are expected to remain perturbed with further possible enhancements due to the expected arrival of the Sept 14th CME. Further enhancements in the solar wind are expected on Sept 19th with probable arrival of the Sept 16th CME and a possible mild high speed stream from the negative polarity coronal hole, which crossed the central meridian on Sept 16th.

Géomagnétisme

The geomagnetic conditions over the past 24 hours were quiet to active. Quiet to unsettled geomagnetic conditions are expected to prevail throughout Sept 17th with some chances for isolated active conditions small chances for minor geomagnetic storms. Mostly quiet to unsettled conditions are expected for Sept 18th and quiet conditions to minor storm levels are anticipated on Sept 19th with the expected arrival of the Sept 16th halo CME and possible mild high speed stream.

Niveaux de flux de protons

Over the past 24 hours the greater than 10 MeV GOES proton flux was at background levels and is expected to continue so over the next days.

Flux d'électrons sur l'orbite géostationnaire

The greater than 2 MeV GOES 16 electron flux was below the 1000 pfu threshold and is expected to remain so in the upcoming days.The 24h electron fluence was at nominal level and is expected to remain so in the next days.

Estimation du nombre international de taches solaires (ISN) pour aujourd'hui : 096, sur la base de 12 stations.

Indices solaires pour 16 Sep 2023

Nombre de Wolf, observé par Catania	///
Flux solaire à 10 cm	140
AK Chambon La Forêt	021
AK Wingst	010
Ap estimé	008
Nombre international de taches solaires estimé	096 - Basé sur 22 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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