Affichage des archives de jeudi, 17 juillet 2025

Bulletin quotidien sur l'activité solaire et géomagnétique du SIDC

Publié: 2025 Jul 17 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
17 Jul 2025	152	017
18 Jul 2025	145	031
19 Jul 2025	140	024

Régions solaires actives et éruptions solaires

Solar flaring activity was low over the past 24 hours, with only four C-class flares identified. SIDC Sunspot Group 562 (NOAA Active Region [AR] 4136, Beta-Gamma-Delta magnetic configuration) produced the brightest flare (SIDC flare 4904, a C5 on 17 Jul at 09:28 UTC) of the past 24 hours. SIDC Sunspot Group 558 (NOAA AR 4142, Beta-Gamma magnetic configuration) and SIDC Sunspot Group 561 (NOAA AR 4145, Beta magnetic configuration) produced the remaining flares. Solar flaring activity is likely to be low over the next 24 hours, with and a chance for M-class flares.

Éjection de masse coronale

No Earth-directed Coronal Mass Ejections (CME) were observed in the last 24 hours.

Vent solaire

During the past 24 hours the Solar Wind (SW) conditions continued to be affected by the the High Speed Stream (HSS) that arrived on 11 July and is associated with SIDC Coronal Hole 104 (positive polarity). The SW speed increased from 550 km/s 700 km/s during the past 24 hours. The interplanetary magnetic field (B) varied between 4 and 8 nT and its North- South component (Bz) fluctuated between -8 and 7 nT. The fast SW conditions are expected to persist in the next 24 hours.

Géomagnétisme

The global geomagnetic conditions registered minor storm levels for a short period of time (NOAA Kp 5 on 16 Jul from 21:00 to 24:00 UTC) while the rest of the past 24 hours varied between quiet and active conditions (NOAA Kp 1+ to 4-). Locally the conditions were milder with active conditions (K BEL 4) registering on 17 Jul from 06:00 to 12:00 UTC, while quiet to unsettled conditions (K BEL 2 to 3) were observed the remaining of the past 24 hours. Active to minor storm conditions are expected in the next 24 hours, with a small chance of a moderate storm.

Niveaux de flux de protons

The greater than 10 MeV proton flux, as measured by the GOES-19 satellite, was at background levels over the past 24 hours and is likely to remain so in the next 24 hours. Nevertheless, there is a small chance that a proton event might occur during the next 24 hours.

Flux d'électrons sur l'orbite géostationnaire

The greater than 2 MeV electron flux, as measured by GOES 19, was mostly above the 1000 pfu alert threshold during the past 24 hours. It is expected to repeat a similar patern in the next 24 hours. The 24-hour electron fluence was at moderate levels during the past 24 hours. It is expected to remain at the current levels in the next 24 hours.

Estimation du nombre international de taches solaires (ISN) pour aujourd'hui : 193, sur la base de 21 stations.

Indices solaires pour 16 Jul 2025

Nombre de Wolf, observé par Catania	222
Flux solaire à 10 cm	152
AK Chambon La Forêt	028
AK Wingst	017
Ap estimé	017
Nombre international de taches solaires estimé	205 - Basé sur 29 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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