Affichage des archives de dimanche, 25 octobre 2020

Bulletin quotidien sur l'activité solaire et géomagnétique du SIDC

Publié: 2020 Oct 25 1230 UTC

Prévisions SIDC

Éruptions solaires

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

Géomagnétisme

Minor storm expected (A>=30 or K=5)

Moniteur de Flux de Proton

Quiet

	Flux de 10 cm	Ap
25 Oct 2020	072	015
26 Oct 2020	073	028
27 Oct 2020	073	007

Bulletin

Solar flaring activity was at very low levels. No significant flares have been recorded. Solar activity is expected to remain at very low levels.

No Earth directed Coronal Mass Ejections (CMEs) were observed in the available coronagraphic imagery.

The greater than 10 MeV proton flux was at background levels over the past 24 hours. It is expected to stay at background levels for the next 24 hours. The greater than 2 MeV electron flux was at moderate levels, reaching 918 pfu at Oct 25 01:55UT, as we are still under the influence of the high solar wind speed caused by the High Speed Streams (HSS) originating from the Coronal hole (CH) crossing Central Meridian (CM) on Oct 19. It is expected to increase further in the 24 hours.

The speed of the solar wind remained enhanced, varying between 515 and 595 km/s (DSCOVR), caused by the presence of the HSS originating from the CH crossing CM on Oct 19. The polarity of the Interplanetary Magnetic Field (IMF) was predominantly away from the Sun (phi angle to positive sector). Bz fluctuated between -5 and +3 nT. The magnitude of the magnetic field varied between 1 and 7 nT. Over the next 24 hours, the solar wind parameters are expected to remain at those levels, as additional effects of the HSS from the CH crossing CM on Oct 22 can be expected.

The geomagnetic conditions were active (K Dourbes=4). The values registered for the past 24 hours were 0-4 for K Dourbes and 2-3 for NOAA Kp. Unsettled to active conditions, with a possibility of a minor storm, are expected for the next 24 hours.

Estimation du nombre international de taches solaires (ISN) pour aujourd'hui : 016, sur la base de 14 stations.

Indices solaires pour 24 Oct 2020

Nombre de Wolf, observé par Catania	///
Flux solaire à 10 cm	072
AK Chambon La Forêt	021
AK Wingst	018
Ap estimé	020
Nombre international de taches solaires estimé	017 - Basé sur 23 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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