Affichage des archives de jeudi, 7 mai 2026

Bulletin quotidien sur l'activité solaire et géomagnétique du SIDC

Publié: 2026 May 07 1237 UTC

Prévisions SIDC

Éruptions solaires

C-class flares expected, (probability >=50%)

Géomagnétisme

Minor storm expected (A>=30 or K=5)

Moniteur de Flux de Proton

Quiet

	Flux de 10 cm	Ap
07 May 2026	118	007
08 May 2026	113	024
09 May 2026	110	011

Régions solaires actives et éruptions solaires

The solar flaring activity was at low levels over the past 24 hours. A total of 7 numbered sunspot groups were identified on the visible solar disk. All regions are relatively simply, classified either as magnetic type alpha or beta. The most prominent activity was a C4.5 flare (SIDC Flare 7621) peaking on May 07 at 02:15 UTC produced from behind the north-east limb. The solar flaring activity is expected to be at low levels over the next 24 hours with very likely C-class flares and chances for isolated M-class flaring.

Éjection de masse coronale

A large filament eruption was detected in the SDO AIA imagery to lift off the southern hemisphere crossing the central meridian around 19:30 UTC on May 06. No clear coronal mass ejection (CME) associated to this eruption has bee identified in the currently available coronagraph imagery. No other Earth-directed CMEs have been identified in the available coronagraph imagery over the past 24 hours.

Vent solaire

Over the past 24 hours the solar wind parameters (as measured by ACE at L1) have exhibited background slow solar wind conditions. The magnitude of the interplanetary magnetic field (B) registered a maximum value of 7.4 nT. The north-south (Bz) component was almost entirely positive (northward), recording a minimum value of -3.2 nT. The solar wind speed remained slow with values below 400 km/s. The B field phi angle was switching between the positive (directed away from the Sun) and the negative sector (directed towards the Sun). The solar wind parameters over the next 24 hours are expected to register a high-speed stream arrival related to the positive-polarity equatorial coronal hole, SIDC CH 158, which crossed the central meridian on May 04.

Géomagnétisme

The geomagnetic conditions over the past 24 hours were quiet. Quiet to active geomagnetic conditions are expected for the next 24 hours with possible isolated minor storms and small chances for moderate storms. Predominantly quiet to active conditions are expected later on May 08 and quiet to unsettled conditions on May 09.

Niveaux de flux de protons

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

Flux d'électrons sur l'orbite géostationnaire

The greater than 2 MeV electron flux as measured by GOES 18 and GOES 19 was close to, but below the 1000 pfu threshold over the past 24 hours and is expected to remain so over the next days. The 24-hour electron fluence was at nominal levels and is expected to remain so over the 24 hours.

Estimation du nombre international de taches solaires (ISN) pour aujourd'hui : 068, sur la base de 17 stations.

Indices solaires pour 06 May 2026

Nombre de Wolf, observé par Catania	///
Flux solaire à 10 cm	120
AK Chambon La Forêt	006
AK Wingst	003
Ap estimé	003
Nombre international de taches solaires estimé	103 - 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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