Affichage des archives de vendredi, 15 mai 2026

Bulletin quotidien sur l'activité solaire et géomagnétique du SIDC

Publié: 2026 May 15 1231 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
15 May 2026	105	024
16 May 2026	102	016
17 May 2026	098	008

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 C5.1 flare (SIDC Flare 7698), peaking at 18:40 UTC on May 14, which was associated with the returning SIDC Sunspot Group 825 (NOAA Active Region 4436, magnetic type beta). There are currently three numbered active regions on the solar disk, all with magnetic type beta. SIDC Sunspot Group 862 (NOAA Active Region 4433) has rotated across the west limb. The solar flaring activity is expected to be low over the next 24 hours, with C-class flares very likely and a chance for M-class flares.

Éjection de masse coronale

A Coronal Mass Ejection (SIDC CME 653) was observed in LASCO/C2 and C3 coronagraph imagery on May 15. The CME is related to post-eruptive arcades from SIDC Sunspot Group 825 (NOAA Active Region 4436), observed in SDO/AIA 304 data starting from around 03:00 UTC on May 15. The bulk of the ejecta appears to be directed mainly northward and is not expected to impact Earth. No other Earth-directed CMEs were observed in the available coronagraph imagery.

Vent solaire

Over the past 24 hours, the solar wind parameters initially reflected slow solar wind conditions, with an enhancement observed during the last hours of the period due to the arrival of the high-speed stream from the large, negative polarity transequatorial coronal hole (returning SIDC Coronal Hole 147). The solar wind speed increased up to approximately 590 km/s. The interplanetary magnetic field values increased from 4 nT to 13 nT. The Bz component varied between -10 nT and 9 nT. The interplanetary magnetic field angle was mostly in the positive sector until around 20:00 UTC on May 14, when it switched to the negative sector. Mostly enhanced solar wind conditions are expected over the next 24 hours due to the continuous influence of the high-speed stream.

Géomagnétisme

Geomagnetic conditions globally were initially at quiet levels (NOAA Kp 1 to 2+ ), becoming unsettled during the last hours of the period (NOAA Kp 3). Locally, geomagnetic conditions were mostly quiet to unsettled (K BEL 1 to 3). Active to minor storm conditions may be possible over the next 24 hours due to the ongoing high-speed stream influence from the large, negative polarity transequatorial coronal hole (returning SIDC Coronal Hole 147).

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 and GOES 19 was below the 1000 pfu threshold in the last 24 hours. 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 is presently at normal levels and is expected to remain so over the next 24 hours.

Estimation du nombre international de taches solaires (ISN) pour aujourd'hui : 048, sur la base de 13 stations.

Indices solaires pour 14 May 2026

Nombre de Wolf, observé par Catania	063
Flux solaire à 10 cm	106
AK Chambon La Forêt	008
AK Wingst	006
Ap estimé	005
Nombre international de taches solaires estimé	052 - 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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