Affichage des archives de samedi, 19 juillet 2025

Bulletin quotidien sur l'activité solaire et géomagnétique du SIDC

Publié: 2025 Jul 19 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
19 Jul 2025	156	011
20 Jul 2025	150	009
21 Jul 2025	140	007

Régions solaires actives et éruptions solaires

Solar flaring activity was low over the past 24 hours, with only three C-class flares identified. SIDC Sunspot Group 525 (NOAA Active Region [AR] 4135) produced the brightest flare, SIDC flare 4915 (a C3) on 19 Jul at 09:07 UTC. SIDC Sunspot Group 522 (NOAA AR 4136, Beta-Gamma magnetic configuration) produced the remaining flares, including the double flare SIDC flare 4913 (a C2) at 13:09 on 18 Jul. Further infrequent flaring activity is expected in the next 24 hours.

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 effects of the High Speed Stream (HSS) that arrived on 11 July subsided and the Solar Wind (SW) conditions are very gradually returning to a slow SW regime. The SW speed varied between 490 and 590 km/s, while the interplanetary magnetic field (B) ranged between 2 and 7 nT. Its North-South component (Bz) fluctuated between -6 and 6 nT. The SW conditions are expected to remain at the same levels in the next 24 hours.

Géomagnétisme

The global geomagnetic conditions reached active levels (NOAA Kp 4) for the interval of 12:00 to 15:00 UTC on 18 Jul. The rest of the past 24 hours they varied between unsettled and quiet levels (NOAA Kp 1 to 3). The local geomagnetic conditions reached active levels (K BEL 4) for the interval of 12:00 to 18:00 UTC on 18 Jul. The rest of the past 24 hours they were at quiet levels (K BEL 1 to 2). Quiet to unsettled conditions are expected to prevail in the next 24 hours.

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 expected to remain so in the next 24 hours.

Flux d'électrons sur l'orbite géostationnaire

The greater than 2 MeV electron flux, as measured by GOES 19, was above the 1000 pfu alert threshold during the past 24 hours. It is expected wane and fluctuate around the threshold level in the next 24 hours. The 24-hour electron fluence was at moderate levels during the past 24 hours and is expected to remain at this level in the next 24 hours.

Estimation du nombre international de taches solaires (ISN) pour aujourd'hui : 162, sur la base de 14 stations.

Indices solaires pour 18 Jul 2025

Nombre de Wolf, observé par Catania	213
Flux solaire à 10 cm	156
AK Chambon La Forêt	023
AK Wingst	016
Ap estimé	015
Nombre international de taches solaires estimé	173 - 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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