Affichage des archives de dimanche, 12 septembre 2021

Bulletin quotidien sur l'activité solaire et géomagnétique du SIDC

Publié: 2021 Sep 12 1236 UTC

Prévisions SIDC

Éruptions solaires

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

Géomagnétisme

No forecast

Moniteur de Flux de Proton

Quiet

	Flux de 10 cm	Ap
12 Sep 2021	088	007
13 Sep 2021	084	004
14 Sep 2021	082	004

Bulletin

The solar activity was at very low levels with no C-class flaring over the past 24 hours. NOAA 2863/Catania 37 (alpha) has now rotated over the west limb and NOAA 2864/Catania 38 (beta) is in the process of rotating. The remaining three active regions on the visible solar disc, namely NOAA 2866/Catania 40 (beta), NOAA 2868/Catania 39 (beta) and NOAA 2869/Catania 41 (beta) have produced only B-class flaring. The X-ray activity is expected to be at very low to low levels for the next 24 hours with 50% change for C-class flaring.

No Earth-directed CMEs were detected in the available coronagraph imagery over the past 24 hours. The newly available LASCO data shows that the long duration C1.1-class flare from NOAA 2868 (peak time at 21:34 UTC) on Sept 10th has resulted in an eruption with significant dimming. Slightly faster eruptions appear to have potentially followed the impulsive B6.8-class flare from NOAA 2869 (peak the at 07:28 UTC) and B5.4-class flare from NOAA 2868 (peak the at 07:43 UTC) on Sept 11th. Those eruptions are currently estimated to miss the Earth.

The greater than 10 MeV proton flux was at nominal levels in the past 24 hours and is expected to remain so in the next 24 hours. The greater than 2MeV electron flux was below the 1000 pfu threshold and is expected to remain so in the next 24 hours. The 24h fluence for the greater than 2MeV electron flux was at nominal levels and is expected to remain so in the next 24 hours.

Over the past 24 hours the solar wind parameters (ACE and DSCOVR) have been mostly at background solar wind levels. The solar wind speed varied between to 296 and 370 km/s. The total magnetic field remained slightly elevated at the beginning of the interval with values in the range of 2 to 13 nT. The Bz component was mostly positive, varying between -8 and 10.5 nT. The interplanetary magnetic field was mostly in the positive sector.

The geomagnetic conditions over the past 24 hours were globally quiet and locally quiet to unsettled. Mostly quiet geomagnetic conditions are expected for the next 24 hours with possible isolated unsettled periods later today.

Estimation du nombre international de taches solaires (ISN) pour aujourd'hui : 050, sur la base de 17 stations.

Indices solaires pour 11 Sep 2021

Nombre de Wolf, observé par Catania	///
Flux solaire à 10 cm	092
AK Chambon La Forêt	010
AK Wingst	009
Ap estimé	008
Nombre international de taches solaires estimé	072 - Basé sur 16 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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