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Bulletin quotidien sur l'activité solaire et géomagnétique du SIDC

Publié: 2023 Jun 09 1231 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
09 Jun 2023	169	006
10 Jun 2023	167	011
11 Jun 2023	167	010

Régions solaires actives et éruptions solaires

The solar flaring activity was at low levels, with several C-class flares being detected in the last 24 hours. The largest flare was a C2.2 flare, peaking at 00:07 UTC on June 08, associated with NOAA AR 3327 (beta-gamma-delta class). This region remains the largest and most complex active region on the disk but produced only low C-class flares. Isolated C-class flaring was produced by NOAA AR 3324 and by NOAA AR 3331 (beta class). NOAA AR 3323 (beta-gamma class) is the second most complex active region on the visible solar disc but remained quiet. Other regions on the disc have simple configuration of their photospheric magnetic field (alpha and beta) and did not show any significant flaring activity. The solar flaring activity is expected to be at low to moderate levels over the next 24 hours with a small chance for isolated X-class flare.

Éjection de masse coronale

In the past 24 hours, several coronal mass ejections (CME) and flows were observed in the available SOHO/LASCO coronagraph imagery and automatically detected by the Cactus tool over. In particular, the CME was observed in SOHO/LASCO-C2 at around 21:27 UTC on June 08. The CME is likely related to the small filament eruption in the southwestern quadrant with an accompanying on disc dimming and a type II radio burst detected around 21:14 UTC on June 08. The CME appears narrow and slow and is unlikely to arrive to Earth. However, a full analysis is still ongoing, and more details will be provided later. No other Earth- directed CMEs have been detected in the available coronagraph imagery.

Vent solaire

Over the past 24 hours the solar wind parameters (ACE and DSCOVR) indicated a return to a slow solar wind regime. The solar wind speed decreased from values around 345 km/s to 280 km/s. The interplanetary magnetic field magnitude was about 5 nT. The southward component of the interplanetary magnetic field fluctuated between -5 nT and 4 nT. The magnetic field orientation was in the positive sector (field directed away from the Sun). Slow solar wind conditions are expected to prevail on June 09. From June 10, the solar wind from a coronal hole with positive polarity in the northern hemisphere may arrive to the Earth, but since the coronal hole is located at high latitudes, the corresponding high speed stream may miss the Earth.

Géomagnétisme

The geomagnetic conditions over the past 24 hours were quiet. Mostly quiet geomagnetic conditions are expected, with chances of active levels from June 10 if the high speed stream from the positive polarity coronal hole in the northern hemisphere arrives.

Niveaux de flux de protons

Over the past 24 hours the greater than 10 MeV GOES proton flux was at nominal levels and is expected to remain so over the next days.

Flux d'électrons sur l'orbite géostationnaire

The greater than 2 MeV electron flux was below the 1000 pfu threshold and is expected to remain below this threshold for the next days.The 24h electron fluence was at normal level. The electron fluence is expected to be at normal levels in the next days.

Estimation du nombre international de taches solaires (ISN) pour aujourd'hui : 165, sur la base de 20 stations.

Indices solaires pour 08 Jun 2023

Nombre de Wolf, observé par Catania	221
Flux solaire à 10 cm	169
AK Chambon La Forêt	008
AK Wingst	006
Ap estimé	005
Nombre international de taches solaires estimé	171 - 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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