Affichage des archives de dimanche, 1 août 2021

Bulletin quotidien sur l'activité solaire et géomagnétique du SIDC

Publié: 2021 Aug 01 1240 UTC

Prévisions SIDC

Éruptions solaires

Quiet conditions (<50% probability of C-class flares)

Géomagnétisme

Quiet (A<20 and K<4)

Moniteur de Flux de Proton

Quiet

	Flux de 10 cm	Ap
01 Aug 2021	076	002
02 Aug 2021	077	004
03 Aug 2021	078	004

Bulletin

The visible solar disc is spotless and the X-ray flux is below C-level. A long duration B2.4-class flare was observed near NOAA AR-2849 Plage. The solar activity is expected to remain at low levels over the next 24 hours.

A large coronal dimming associated with the long duration B2.4-class flare was observed on July 31 from 15:54 UTC to 18:06 UTC in the south-west quadrant (near latitude -12 degrees and longitude 30 degree). Further investigation on this event will be provided as data comes in.

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

The solar wind parameters (as observed by ACE and DSCOVR) show the continuation of a slow return towards an ambient background and slow solar wind speed regime. Solar wind speed decreased from about 460 km/s to 400 km/s. Total interplanetary magnetic field strength remained below 5 nT. The Bz component underwent only weak deviations between -4.0nT and +3.5 nT. The solar wind conditions are expected to continue it slow returned toward a slow solar wind speed regime. The solar wind may be temporarily slightly enhanced later today due to some possible effect of the arrival of the coronal mass ejection observed on July 28 at 10:36 UTC (with a projected speed of 400 km/s).

The geomagnetic conditions were mostly quiet over the past 24 hours with some short periods of unsettled condition observed at the local station Dourbes (K-Dourbes = 3). The conditions are expected to remain quiet as the Earth is expected to remain in the mostly slow solar wind speed regime for the next 24 hours.

Estimation du nombre international de taches solaires (ISN) pour aujourd'hui : 010, sur la base de 14 stations.

Indices solaires pour 31 Jul 2021

Nombre de Wolf, observé par Catania	///
Flux solaire à 10 cm	076
AK Chambon La Forêt	010
AK Wingst	008
Ap estimé	007
Nombre international de taches solaires estimé	002 - Basé sur 28 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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