Affichage des archives de vendredi, 31 décembre 2021

Bulletin quotidien sur l'activité solaire et géomagnétique du SIDC

Publié: 2021 Dec 31 1231 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

Quiet

	Flux de 10 cm	Ap
31 Dec 2021	100	004
01 Jan 2022	098	010
02 Jan 2022	096	021

Bulletin

NOAA region 2918 (Catania group 96) produced a few more C flares while in decay. The largest was a C9.8 flare peaking at 6:56UT. The most significant region on disc remains NOAA region 2916 which continues to have mixed polarity fields in the trailing part. It nevertheless remained quiet and stable. The two unipolar regions on disc (NOAA 2917 and 2919) remained unipolar while a new region is starting to emerge around S15E32. Flaring at C level remains likely with only a limited chance for flaring to reach M class levels.

No Earth directed CMEs have been observed in coronagraph data.

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 remained under the 1000 pfu threshold. The 24h electron fluence was at normal levels and is expected to be at normal levels over the next 24 hours. Electron fluxes could start building up again in the next days with the expected elevated Solar wind speeds.

Solar wind remained only slightly elevated but showed an overall return to slow Solar wind conditions. Solar wind speed decreased from around 500km/s to 430km/s. The magnetic field magnitude hovered around a nominal 4nT value. The magnetic field phi angle indicated connection to a positive polarity sector. A further decrease to slow Solar wind conditions is expected over the next 24 hours. This is expected to be followed by a renewed increase starting around midnight 1-2 January related to another equatorial positive polarity coronal hole that crossed the central meridian December 29-30.

Geomagnetic conditions were mostly quiet (NOAA Kp 0-2) with only an isolated period of unsettled conditions locally (local K Belgium reaching 3 early in the period). Geomagnetic conditions are expected to be quiet over the next 24 hours before reaching unsettled conditions and potentially active levels in response to the elevated Solar wind conditions by early January 2.

Estimation du nombre international de taches solaires (ISN) pour aujourd'hui : 060, sur la base de 14 stations.

Indices solaires pour 30 Dec 2021

Nombre de Wolf, observé par Catania	///
Flux solaire à 10 cm	102
AK Chambon La Forêt	008
AK Wingst	010
Ap estimé	008
Nombre international de taches solaires estimé	072 - Basé sur 14 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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