Affichage des archives de jeudi, 10 juillet 2025

Bulletin quotidien sur l'activité solaire et géomagnétique du SIDC

Publié: 2025 Jul 10 1231 UTC

Prévisions SIDC

Éruptions solaires

M-class flares expected (probability >=50%)

Géomagnétisme

Quiet (A<20 and K<4)

Moniteur de Flux de Proton

Quiet

	Flux de 10 cm	Ap
10 Jul 2025	123	007
11 Jul 2025	125	011
12 Jul 2025	123	013

Régions solaires actives et éruptions solaires

Solar flaring activity was low over the past 24 hours, with only C-class flares identified. The largest flare was a C3.8 flare (SIDC Flare 4823) peaking on July 10 at 06:42 UTC, which was produced by SIDC Sunspot Group 551. A total of 7 numbered sunspot groups were identified on the disk over the past 24 hours. SIDC Sunspot Group 522 (NOAA Active Region 4136) and SIDC Sunspot Group 525 (NOAA Active Region 4135) are the largest regions on disk, and both have a Beta-Gamma magnetic configuration. Solar flaring activity is expected to be moderate over the next 24 hours, with C-class flares expected and M-class flares likely.

Éjection de masse coronale

No Earth-directed Coronal Mass Ejections (CMEs) have been detected in the available coronagraph images. Further analysis of a CME observed at 16:00 UTC on July 9 in LASCO-C2 data, associated with a filament eruption seen in SDO/AIA 304 and 194 at 06:36 UTC on July 09 show that it is expected to miss the Earth.

Trous coronaux

Returning SIDC Coronal Hole 104 (low to mid latitude coronal hole with a positive polarity) started to cross the central meridian on July 08 and is continuing to cross the central meridian.

Vent solaire

Over the past 24 hours, the Earth was under the slow solar wind regime. The solar wind speed ranged from 380 km/s to 460 km/s. The total interplanetary magnetic field ranged from 0 nT to 4 nT, with the Bz component reaching a minimum of -4 nT. The phi-angle was mainly in the negative sector (directed towards the Sun) until 05:02 UTC on July 10 when it switched to the positive sector. Slow solar wind conditions are expected for the next 24 hours.

Géomagnétisme

The geomagnetic conditions over the past 24 hours were globally quiet (Kp 1-2) and quiet to unsettled locally (K BEL 1-3). Quite too unsettled 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 was at background 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, as measured by the GOES-18 and GOES-19 satellite, crossed the 1000 pfu threshold at 14:30 UTC on July 09 and has fluctuated around this threshold since then. The electron flux is expected to continue to fluctuate around this threshold in the next 24 hours. The 24-hour electron fluence was at moderate levels and is expected to remain at moderate levels over the next 24 hours.

Estimation du nombre international de taches solaires (ISN) pour aujourd'hui : 077, sur la base de 20 stations.

Indices solaires pour 09 Jul 2025

Nombre de Wolf, observé par Catania	089
Flux solaire à 10 cm	120
AK Chambon La Forêt	011
AK Wingst	009
Ap estimé	009
Nombre international de taches solaires estimé	087 - Basé sur 28 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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