Affichage des archives de mercredi, 18 juin 2025

Bulletin quotidien sur l'activité solaire et géomagnétique du SIDC

Publié: 2025 Jun 18 1231 UTC

Prévisions SIDC

Éruptions solaires

M-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
18 Jun 2025	137	018
19 Jun 2025	135	012
20 Jun 2025	137	006

Régions solaires actives et éruptions solaires

Solar flaring activity was at high levels over the past 24 hours. A total of 7 numbered sunspot groups were identified on the visible solar disk. SIDC Sunspot Group 523 (NOAA Active Region 4114) remains the largest and most complex active region. It is classified as magnetic type beta-gamma-delta and produced an impulsive X1.2 flare (SIDC Flare 4675) with peak time 21:49 UTC on June 17. SIDC Sunspot Group 522 (NOAA Active Region 4115) has shown some increase in complexity is now classified as magnetic type beta-gamma. Two new regions, SIDC Sunspot Group 526 and SIDC Sunspot Group 527, have rotated from over the east limb and are producing low levels of activity. SIDC Sunspot Group 520 (NOAA Active Region 4110) has rotated behind the west limb. The remaining active regions on the visible disk have been mostly simple and quiet. Solar flaring activity is expected to be moderate over the next 24 hours with C-class flares expected and likely M-class flares.

Éjection de masse coronale

A slow partial halo coronal mass ejection (SIDC CME 522) has left the Sun around 03:36 UTC on June 18 as observed in SOHO/LASCO C2 data. The CME is related to an activity behind the west limb and no impact on Earth is expected. No Earth-directed CMEs have been identified in the available coronagraph imagery over the past 24 hours.

Trous coronaux

A large positive polarity coronal hole (SIDC Coronal Hole 104) continues to reside on the central meridian. This is a mid-latitude southern coronal hole covering a large longitudinal range which first crossed the central meridian on June 11. A mild high speed stream emanating from it is expected to continue influencing the Earth over the next days.

Vent solaire

Over the past 24 hours the solar wind parameters (ACE and DSCOVR) were under the continuous mild influence from a high speed stream. The interplanetary magnetic field (B) was slightly enhanced with a maximum value of 9.6 nT and a minimum Bz of -8 nT. The solar wind speed reached a maximum of 530 km/s. The B field phi angle was predominantly in the positive sector (directed away from the Sun). The solar wind conditions are expected to continue to be under a mild influence of a high speed stream over the next days. There are small chances for an influence from an interplanetary shock and a mild glancing blow arrival later on June 18.

Géomagnétisme

The geomagnetic conditions over the past 24 hours were quiet to unsettled. Quiet to active geomagnetic conditions are expected for the next 24 hours with low chances for isolated minor storms in case of a possible mild glancing blow and/or shock arrival from two CMEs (SIDC CMEs 518 and 519) on June 15.

Niveaux de flux de protons

Over the past 24 hours the greater than 10 MeV GOES proton flux has been at nominal levels. The greater than 10 MeV GOES proton flux is expected to expected to remain at nominal levels, though some increase is possible in case of fast eruptive solar activity related to SIDC Sunspot Group 523 (NOAA Active Region 4114).

Flux d'électrons sur l'orbite géostationnaire

The greater than 10 MeV GOES 18 and GOES 19 electron fluxes briefly exceeded the 1000 pfu threshold over the last 24 hours and are expected to exceed the threshold again over the next 24 hours. The 24-hour electron fluence was at the border of nominal to moderate levels and is expected to remain so in the next 24 hours.

Estimation du nombre international de taches solaires (ISN) pour aujourd'hui : 134, sur la base de 26 stations.

Indices solaires pour 17 Jun 2025

Nombre de Wolf, observé par Catania	147
Flux solaire à 10 cm	139
AK Chambon La Forêt	020
AK Wingst	010
Ap estimé	011
Nombre international de taches solaires estimé	114 - Basé sur 27 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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