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Bulletin quotidien sur l'activité solaire et géomagnétique du SIDC

Publié: 2025 Jul 23 1231 UTC

Prévisions SIDC

Éruptions solaires

C-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
23 Jul 2025	145	020
24 Jul 2025	143	006
25 Jul 2025	143	007

Régions solaires actives et éruptions solaires

Solar flaring activity was low over the past 24 hours, with only C-class flares. The strongest flare was a C6.4 flare (SIDC Flare 4932) peaking at 20:12 UTC on July 22, which was associated with SIDC Sunspot Group 565 (NOAA Active Region 4150, magnetic type beta). There are currently nine numbered active regions on the solar disk. SIDC Sunspot Groups 564, 565, 566, 567, 570 (NOAA Active Regions 4149, 4150, 4151, 4152, 4153) are the most complex ones with magnetic type beta. SIDC Sunspot Group 571 (magnetic type alpha) has emerged in the southwest quadrant. SIDC Sunspot Groups 522, 553, 559, 563 (NOAA Active Regions 4136, 4140, 4143, 4148) have rotated over the west limb. The solar flaring activity is expected to be moderate over the next 24 hours, with C-class flares very likely and a chance for M-class flares.

Éjection de masse coronale

No Earth-directed Coronal Mass Ejections (CMEs) were observed in the available coronagraph imagery in the last 24 hours.

Vent solaire

Over the past 24 hours, the solar wind parameters (ACE) were enhanced, most likely due to the influence of the high-speed stream from the negative polarity coronal hole (SIDC Coronal Hole 116). Speed values increased up to 680 km/s. The interplanetary magnetic field values were between 4 nT and 24 nT. The Bz component varied between -14 nT and 17 nT. The interplanetary magnetic field angle was mostly in the negative sector. Mostly enhanced solar wind conditions due to the influence of the high- speed stream are expected over the next 24 hours.

Géomagnétisme

Geomagnetic conditions globally reached minor storm conditions (NOAA Kp 5- to 5) between 18:00 UTC on July 22 and 00:00 UTC on July 23. Geomagnetic conditions locally were mostly at unsettled levels (K BEL 3), with two intervals of active levels (K BEL 4) between 19:00 UTC and 21:00 UTC on July 22 and 02:00 UTC and 04:00 UTC on July 23. Mostly quiet to unsettled conditions are expected globally and locally over the next 24 hours.

Niveaux de flux de protons

The greater than 10 MeV proton flux was below the 10 pfu threshold level over the past 24 hours. It is expected to remain below the threshold level over the next 24 hours.

Flux d'électrons sur l'orbite géostationnaire

The greater than 2 MeV electron flux measured by GOES 18 was over the 1000 pfu threshold until 23:00 UTC on July 22. The greater than 2 MeV electron flux measured by GOES 19 was over the 1000 pfu threshold until 20:00 UTC on July 22. The greater than 2 MeV electron flux is expected to be below the 1000 pfu threshold over the next 24 hours. The 24-hour electron fluence was at moderate levels but is expected to return to normal levels over the next 24 hours.

Estimation du nombre international de taches solaires (ISN) pour aujourd'hui : 112, sur la base de 12 stations.

Indices solaires pour 22 Jul 2025

Nombre de Wolf, observé par Catania	134
Flux solaire à 10 cm	145
AK Chambon La Forêt	030
AK Wingst	015
Ap estimé	017
Nombre international de taches solaires estimé	112 - Basé sur 25 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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