Affichage des archives de dimanche, 11 juin 2023

Bulletin quotidien sur l'activité solaire et géomagnétique du SIDC

Publié: 2023 Jun 11 1232 UTC

Prévisions SIDC

Éruptions solaires

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

Géomagnétisme

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

Moniteur de Flux de Proton

Quiet

	Flux de 10 cm	Ap
11 Jun 2023	165	016
12 Jun 2023	163	013
13 Jun 2023	161	008

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 C5.7 flare, peaking at 21:16 UTC on June 10, associated with NOAA AR 3323 (beta class). This region is currently rotating out of view over the west limb. NOAA AR 3327 (beta-gamma) is the most complex active region on the disk but produced only C-class flares. Isolated C-class flaring was also produced by NOAA AR 3331 (beta class). 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 levels over the next 24 hours with C-class flares likely and M-class flares possible.

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. CME was observed in SOHO/LASCO-C2 at around 17:24 UTC on June 09, likely related to the M2.5 flare from NOAA AR 3331. The CME is directed to the south-east and the bulk of the CME is not expected to be Earth directed. However, a glancing blow of the shock may impact Earth in the late evening of June 13 or in the first half of June 14. During the last 24 hours there were no other potentially Earth-directed CMEs detected in the available coronagraph observations.

Vent solaire

At the beginning of the period, the solar wind parameters reflected slow solar wind conditions. The solar wind speed was approximately 310 km/s; the total interplanetary magnetic field was weak, below 4 nT. The magnetic field orientation was in the negative sector (field towards the Sun). The solar wind conditions became slightly disturbed later on, with the total interplanetary magnetic field reaching the values up to 15 nT at around 03:20 UTC on June 11. The southward interplanetary magnetic component, Bz, ranged between -10 nT and 15 nT. The solar wind velocity followed an increasing trend, rising from 310 km/s to 410 km/s. The magnetic field orientation has switched to the predominantly positive sector (field directed away from the Sun) since 00:05 UTC on June 11. This is probably associated with the arrival of the expected high speed stream (HSS) from a positive polarity coronal hole in the northern hemisphere. The solar wind conditions are expected to remain elevated for the next days with ongoing HSS passage a low probability for further minor enhancements from late on June 13, due to the CME on June 09, which may have a glancing blow at Earth.

Géomagnétisme

During last 24 hours the geomagnetic conditions were at quiet to unsettled levels (NOAA KP 1-3 and K-Bel 1-3). Geomagnetic conditions are expected at quiet to active levels during next days with a chance for isolated minor storm period due to a high-speed stream influence and a possible glancing blow ICME passage late on June 13 – early June 14.

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 : 145, sur la base de 18 stations.

Indices solaires pour 10 Jun 2023

Nombre de Wolf, observé par Catania	///
Flux solaire à 10 cm	161
AK Chambon La Forêt	012
AK Wingst	006
Ap estimé	005
Nombre international de taches solaires estimé	144 - Basé sur 24 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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