Affichage des archives de jeudi, 4 novembre 2021

Bulletin quotidien sur l'activité solaire et géomagnétique du SIDC

Publié: 2021 Nov 04 1301 UTC

Prévisions SIDC

Éruptions solaires

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

Géomagnétisme

Moderate (ISES: Major) magstorm expected (A>=50 or K=6)

Moniteur de Flux de Proton

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

	Flux de 10 cm	Ap
04 Nov 2021	088	066
05 Nov 2021	086	037
06 Nov 2021	084	013

Bulletin

The strongest flare of the period was a C5.2 flare peaking at 21:17 from NOAA active region 2887 (Catania group 66) as it is turning over the Western limb. The simple unipolar NOAA region 2893 (Catania group 68) remained quiet as did the NOAA region 2891 (Catania group 67) which seems to evolve towards a unipolar spot. A new region is also turning onto the Southern hemisphere in the East, which produced a C3.5 flare peaking at 10:55UT. Overall, further C flares are expected in the next 24 hours with only a minor possibility of an M flare.

No new Earth directed CMEs have been recorded in coronagrpah data.

The more than 10MeV proton flux remained slightly enhanced and briefly peaked over the event threshold at 20:55UT with the arrival of the CME. A gentle decay is expected but there remains some possibility of a proton event. The greater than 2 MeV electron flux was below the 1000 pfu threshold. The 24h electron fluence is at normal levels and expected to be at normal to moderate levels over the next days.

Solar wind saw the arrival of the expected series of CMEs, somewhat earlier than anticipated. Given the measured Solar wind velocity it is likely that the observed ICME is related to the November 2 CME that most probably caught up with the preceding CMEs. A shock was observed in Solar wind data as recorded by DSCOVR when at 19:24UT Solar wind speed jumped from 498km/s to 542 km/s and the interplanetary magnetic field jumped from 4nT to 9nT. Since then Solar wind speed fluctuated around 700 km/s and the interplanetary magnetic field peaked over 20nT and was consistently in the 10-24nT range. Bz was negative for a significant amount of time with values down to -18nT. Solar wind is expected to remain enhanced for the remainder of the day and into November 5 as the CME(s) pass.

Geomagnetic conditions reached minor to major storm levels (NOAA Kp reaching 7 while local K Dourbes reached 6). Further minor to moderate geomagnetic storms can be expected as the CME(s) pass.

Estimation du nombre international de taches solaires (ISN) pour aujourd'hui : 026, sur la base de 18 stations.

Indices solaires pour 03 Nov 2021

Nombre de Wolf, observé par Catania	050
Flux solaire à 10 cm	089
AK Chambon La Forêt	056
AK Wingst	026
Ap estimé	024
Nombre international de taches solaires estimé	034 - 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

<< Aller à l'aperçu quotidien