Affichage des archives de dimanche, 10 septembre 2023

Bulletin quotidien sur l'activité solaire et géomagnétique du SIDC

Publié: 2023 Sep 10 1244 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
10 Sep 2023	160	006
11 Sep 2023	156	007
12 Sep 2023	150	007

Régions solaires actives et éruptions solaires

During last 24 hours solar flaring activity has decreased and only a few C-class flares were reported. The strongest reported flare was GOES C8.3 flare which peaked at 01:55 UT on September 10. The flare originated from the Catania sunspot group 44 (NOAA AR 3423) which somewhat decreased in the complexity of its photospheric magnetic field and it has presently beta configuration. The EUV observations show that the flare was associated with the eruption, but as the coronagraph data are not yet available it is not possible to estimate if the associated CME will be Earth directed. More will be reported when data become available. All the numbered active regions have presently beta configuration of their photospheric magnetic field. We can expect C-class flares in the coming hours while isolated M-class flares are possible but not very probable.

Éjection de masse coronale

Presently available observations do not show any Earth directed CME.

Trous coronaux

Two narrow and elongated coronal holes started to cross the central meridian today, one at the Northern and another one at Southern solar hemisphere. The coronal hole at the Northern hemisphere has positive polarity and the one at Southern hemisphere is somewhat smaller and it has negative polarity. The solar wind associated with these coronal holes can be expected at Earth starting from the afternoon of September 13.

Vent solaire

Earth is still inside the slow solar wind with the solar wind plasma characteristics fluctuating very little during the last 24 hours. The solar wind velocity remained to be about 330 km/s and the interplanetary magnetic field magnitude is about 6 nT.

Géomagnétisme

During last 24 hours the geomagnetic conditions were quiet and we expect them to stay so in the coming hours.

Niveaux de flux de protons

The greater than 10 MeV proton flux was at the background levels and we do not expect significant change in the coming hours.

Flux d'électrons sur l'orbite géostationnaire

The greater than 2 MeV electron flux still fluctuates around the 1000 pfu threshold. The 24h electron fluence is at normal level. We do not expect significant change in the coming hours.

Estimation du nombre international de taches solaires (ISN) pour aujourd'hui : 191, sur la base de 20 stations.

Indices solaires pour 09 Sep 2023

Nombre de Wolf, observé par Catania	///
Flux solaire à 10 cm	161
AK Chambon La Forêt	010
AK Wingst	009
Ap estimé	008
Nombre international de taches solaires estimé	144 - Basé sur 27 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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