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Bulletin quotidien sur l'activité solaire et géomagnétique du SIDC

Publié: 2025 Aug 02 1236 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
02 Aug 2025	146	009
03 Aug 2025	148	010
04 Aug 2025	150	013

Régions solaires actives et éruptions solaires

Solar flaring activity was at low levels with low C-class flaring over the past 24 hours. A total of 10 numbered sunspot groups were identified on the visible solar disk, all of them being magnetically simple, classified as magnetic type beta or alpha. The most notable activity was a C3.7 flare with peak time 11:09 UTC on Aug 02, produced by SIDC Sunspot Group 570 (NOAA Active Region 4153) from near the west limb. This region, classified as magnetic type beta, has produced most of the low flaring activity over the past 24 hours together with SIDC Sunspot Group 585 (NOAA Active Region 4167). The latter region has exhibited further flux emergence and growth becoming the largest and most complex region on the visible disc, currently classified as magnetic type beta-gamma. The solar flaring activity is expected to be at low to moderate levels over the next 24 hours with background C-class flaring and increasing chances for M-class flaring mostly related to regions SIDC Sunspot Group 570 and SIDC Sunspot Group 585.

Éjection de masse coronale

No other Earth-directed coronal mass ejection (CMEs) have been detected in the available coronagraph imagery over the past 24 hours.

Vent solaire

Over the past hours the solar wind parameters as measured by ACE continued to be slightly elevated under a mild influence of a high- speed stream from a negative polarity coronal hole. The total interplanetary magnetic field (B) reached a maximum of 8 nT with a minimum north-south component, Bz, of -7 nT. The solar wind speed varied between 422 km/s and 593 km/s. The B field phi angle remained predominantly in the negative sector (directed towards the Sun). The solar wind conditions are expected to register slow transition towards nominal slow solar wind conditions over the next 24 hours. Mostly nominal solar wind conditions are expected on Aug 03. Some enhancements are possible on Aug 04 with an anticipated new mild high speed stream arrival.

Géomagnétisme

The geomagnetic conditions over the past 24 hours were quiet to unsettled. Quiet to unsettled geomagnetic conditions are expected for the next days with chances for isolated active periods on Aug 04.

Niveaux de flux de protons

Over the past 24 hours the greater than 10 MeV GOES proton flux has been at nominal levels and is expected to remain so over the next days.

Flux d'électrons sur l'orbite géostationnaire

The greater than 2 MeV GOES electron flux has exceeded the 1000 pfu threshold over the past 24 hours and is expected to exceed the threshold again in the next 24 hours. The 24-hour electron fluence was at nominal levels and is expected to remain so in the next 24 hours.

Estimation du nombre international de taches solaires (ISN) pour aujourd'hui : 135, sur la base de 08 stations.

Indices solaires pour 01 Aug 2025

Nombre de Wolf, observé par Catania	///
Flux solaire à 10 cm	146
AK Chambon La Forêt	025
AK Wingst	014
Ap estimé	016
Nombre international de taches solaires estimé	139 - Basé sur 24 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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