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Bulletin quotidien sur l'activité solaire et géomagnétique du SIDC

Publié: 2025 Jul 20 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
20 Jul 2025	155	008
21 Jul 2025	150	006
22 Jul 2025	145	005

Régions solaires actives et éruptions solaires

Solar flaring activity was low over the past 24 hours, with seven C-class flares identified. SIDC Sunspot Group 559 (NOAA Active Region [AR] 4143, Beta-Gamma magnetic configuration) produced three of those flares. SIDC Sunspot Group 562 (NOAA AR 4136, Beta-Gamma magnetic configuration) and SIDC Sunspot Group 564 (NOAA AR 4149, Beta magnetic configuration) produced two flares each. The brightest flare of the past 24 hours was SIDC flare 4922, a double-peaked C7 flare with the highest peak on 20 Jul at 07:41 UTC. More C-class flaring activity is expected in the next 24 hours, with a chance of an isolated M-class flare.

Éjection de masse coronale

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

Trous coronaux

SIDC Coronal Hole (CH) 116 with negative polarity started crossing the central solar meridian during the past 24 hours. Due to its elongated and irregular shape it is not expected to produce a very fast High Speed Stream (HSS). In any case, any effects on the Earth's atmosphere from this CH crossing are expected to register on 23 Jul.

Vent solaire

The Solar Wind (SW) conditions returned to a slow SW regime during the past 24 hours. The SW speed dropped from 520 to 400 km/s, while the interplanetary magnetic field (B) ranged between 3 and 6 nT, and its North-South component (Bz) fluctuated between -5 and 5 nT. A similar pattern is expected for the next 24 hours.

Géomagnétisme

The geomagnetic conditions registered globally quiet levels (NOAA Kp 1- to 2+) and locally quiet to unsettled levels (BEL 2 to 3). They are expected to remain at those levels during 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 to remain above the alert threshold in the next 24 hours. The 24-hour electron fluence increased from moderate to high levels on 20 Jul at 05:00 UTC. It is expected to remain at high levels in the next 24 hours.

Estimation du nombre international de taches solaires (ISN) pour aujourd'hui : 157, sur la base de 12 stations.

Indices solaires pour 19 Jul 2025

Nombre de Wolf, observé par Catania	///
Flux solaire à 10 cm	153
AK Chambon La Forêt	014
AK Wingst	010
Ap estimé	009
Nombre international de taches solaires estimé	159 - Basé sur 19 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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