Affichage des archives de jeudi, 19 juin 2025

Bulletin quotidien sur l'activité solaire et géomagnétique du SIDC

Publié: 2025 Jun 19 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
19 Jun 2025	137	014
20 Jun 2025	139	014
21 Jun 2025	141	011

Régions solaires actives et éruptions solaires

Solar flaring activity was at low levels over the past 24 hours. A total of 8 numbered sunspot groups were identified on the visible solar disk. The strongest activity was a C7.9 flare (SIDC Flare 4701), peak time 09:17 UTC on June 19. The flare was produced by SIDC Sunspot Group 523 (NOAA Active Region 4114), which remains the most complex region on disk, classified as magnetic type beta-gamma- delta. SIDC Sunspot Group 526 (NOAA Active Region 4117) which recently rotated from over the east limb is now classified as magnetic type beta- gamma. These two regions are responsible for most of the flaring activity over the past 24 hours. The remaining active regions on the visible disk have been simple and/or quiet. Solar flaring activity is expected to be at moderate levels over the next 24 hours with likely M-class flares.

Éjection de masse coronale

No Earth-directed coronal mass ejections (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 influence of a high speed stream from a large positive polarity coronal hole, part of which still resides on the central meridian. The interplanetary magnetic field (B) was enhanced with a maximum value of 10.7 nT and a minimum Bz of -8 nT. The solar wind speed reached up to 600 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 the influence of a high speed stream over the next days.

Géomagnétisme

The geomagnetic conditions over the past 24 hours were quiet to active. Quiet to active geomagnetic conditions are expected for the next 24 hours.

Niveaux de flux de protons

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

Flux d'électrons sur l'orbite géostationnaire

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

Estimation du nombre international de taches solaires (ISN) pour aujourd'hui : 132, sur la base de 21 stations.

Indices solaires pour 18 Jun 2025

Nombre de Wolf, observé par Catania	128
Flux solaire à 10 cm	137
AK Chambon La Forêt	022
AK Wingst	018
Ap estimé	018
Nombre international de taches solaires estimé	131 - Basé sur 32 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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