Affichage des archives de jeudi, 30 avril 2020

Bulletin quotidien sur l'activité solaire et géomagnétique du SIDC

Publié: 2020 Apr 30 1234 UTC

Prévisions SIDC

Éruptions solaires

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

Géomagnétisme

Active conditions expected (A>=20 or K=4)

Moniteur de Flux de Proton

Quiet

	Flux de 10 cm	Ap
30 Apr 2020	070	003
01 May 2020	070	009
02 May 2020	071	015

Bulletin

Solar X-ray flux remained below B level. Active Region (AR) 2760 showed some further sunspot emergence, while newly numbered region AR 2762 showed signs of decay. The AR 2761 is now only a plage region. Solar flaring activity is expected to remain at very low levels.

No Earth directed Coronal Mass Ejections (CMEs) were observed in the available coronagraphic imagery in the last 24 hours.

The greater than 10 MeV proton flux was at nominal levels over the past 24 hours and is expected to stay at nominal levels for the next 24 hours. The greater than 2 MeV electron flux was between nominal and moderate levels over the past 24 hours and is expected to be at nominal to moderate levels over the next 24 hours.

The solar wind speed near Earth decreased from around 370 km/s to 270 km/s and the total magnetic field varied between 2 and 4 nT (DSCOVR) over the past 24 hours. The Interplanetary Magnetic Field (IMF) was predominantly oriented towards the Sun (phi angle in the negative sector. Bz was mostly negative, with a minimum value of around -3 nT. Nominal solar wind conditions are expected for Apr 30 - May 01. The filament eruption observed on April 27 that possibly had an Earth directed component may produce a slight enhancement in solar wind parameters at Earth on May 02.

Geomagnetic conditions were quiet (local K Dourbes and NOAA Kp recorded values between 0-2 and 0-1, respectively). Quiet geomagnetic conditions are expected for Apr 30 - May 01 with isolated unsettled episodes possible. The possibility of an active interval on May 02, due to a possible interaction with the eruption of Apr 27, is also not excluded.

Estimation du nombre international de taches solaires (ISN) pour aujourd'hui : 020, sur la base de 28 stations.

Indices solaires pour 29 Apr 2020

Nombre de Wolf, observé par Catania	///
Flux solaire à 10 cm	070
AK Chambon La Forêt	006
AK Wingst	004
Ap estimé	003
Nombre international de taches solaires estimé	023 - 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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