Affichage des archives de vendredi, 4 juin 2021

Bulletin quotidien sur l'activité solaire et géomagnétique du SIDC

Publié: 2021 Jun 04 1240 UTC

Prévisions SIDC

Éruptions solaires

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

Géomagnétisme

Quiet (A<20 and K<4)

Moniteur de Flux de Proton

Quiet

	Flux de 10 cm	Ap
04 Jun 2021	075	003
05 Jun 2021	075	004
06 Jun 2021	075	003

Bulletin

The solar activity was quiet over the past 24 hours, with the GOES X-ray flux remaining below C-level. The bipolar sunspot group (Catania sunspot group 1, NOAA-AR 2827) remained mostly stable and produced very few B-class flares. The sunspot region (Catania sunspot group 2, NOAA-AR 2829) turned to a bipolar region (from alpha to beta magnetic configuration) and produced several B-class flares. The solar activity is expected to remain quiet for the next 24 hours with a small probability to produce C-class flare.

No Earth directed Coronal Mass Ejection (CME) has been detected in the available coronagraph imagery.

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) showed an ambient background and slow solar wind speed regime. The solar wind speed ranged between 280 km/s to 320 km/s. The interplanetary magnetic field magnitude was slightly more elevated reaching 8 nT, and Bz components varied between -5.3 nT and 6.3 nT. The high-speed stream associated with the equatorial coronal hole (that reached the central meridian on May 31) may still impact the solar condition near Earth later today or tomorrow.

The geomagnetic conditions were mostly quiet over the past 24 hours (NOAA- Kp: 0-2, and K-Dourbes: 0-3). The conditions may become more active with the arrival of the high-speed streams from the equatorial coronal hole (that reached the central meridian on May 31) later today or tomorrow.

Estimation du nombre international de taches solaires (ISN) pour aujourd'hui : 032, sur la base de 21 stations.

Indices solaires pour 03 Jun 2021

Nombre de Wolf, observé par Catania	035
Flux solaire à 10 cm	076
AK Chambon La Forêt	010
AK Wingst	///
Ap estimé	008
Nombre international de taches solaires estimé	030 - Basé sur 31 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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