Affichage des archives de mercredi, 7 mai 2025

Bulletin quotidien sur l'activité solaire et géomagnétique du SIDC

Publié: 2025 May 07 1231 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
07 May 2025	155	010
08 May 2025	158	019
09 May 2025	160	022

Régions solaires actives et éruptions solaires

Solar flaring activity was low but very frequent over the past 24 hours, with approximately 20 C-class flares identified. SIDC Sunspot Group 469 (NOAA Active Region 4079, Beta-Gamma magnetic configuration) produced all of the activity with the brightest flare being a C4 on 6 May at 17:07 UTC. For the next 24 hours M-class activity originating from SIDC Sunspot Group 469 is likely and there is a small chance for an X-class flare.

Éjection de masse coronale

A Coronal Mass Ejection (CME) can be seen in LASCO-C2/SOHO images and was detected by CACTus as launched on 6 May 18:00 UTC. It is associated with SIDC Sunspot Group 469 (NOAA active region 4079). Although it is a relatively narrow CME, there is a chance to produce a glancing blow to the Earth's environment at the first half of 9 May.

Vent solaire

During the last 24 hours the High Speed Stream (HSS) that arrived on 4 May subsided significantly. The Solar Wind (SW) speed dropped from 850 km/s to 500 km/s, the interplanetary magnetic field (B) varied between 1 and 7 nT, and its North-South component (Bz) fluctuated between -6 and 5 nT during the same period. Another HSS, associated with the SIDC coronal hole 111 is expected to arrive in the next 24 hours.

Géomagnétisme

The geomagnetic conditions registered globally active levels for a short period of time (NOAA Kp 4- on 6 May at 21:00 to 24:00 UTC), while of the rest of the last 24 hours they fluctuated between quiet and unsettled levels (NOAA Kp 2+ to 3+). Locally the geomagnetic conditions registered unsettled to quiet levels (K BEL 3 to 2) during the same period. In the next 24 hours they are expected to continue at active to unsettled levels both globally and locally.

Niveaux de flux de protons

The greater than 10 MeV proton flux, as measured by the GOES-19 satellite, was at nominal 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 above the 1000 pfu threshold during the past 24 hours, with a peak value at 10000 pfu. It is expected to remain above the alert level during the next 24 hours as another high speed stream is very likely to arrive. The 24-hour electron fluence continued to be at high levels during the past 24 hours. It is expected to gradually drop to moderate levels some time in the next 24 hours.

Estimation du nombre international de taches solaires (ISN) pour aujourd'hui : 082, sur la base de 11 stations.

Indices solaires pour 06 May 2025

Nombre de Wolf, observé par Catania	///
Flux solaire à 10 cm	156
AK Chambon La Forêt	021
AK Wingst	018
Ap estimé	017
Nombre international de taches solaires estimé	094 - Basé sur 21 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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