Bulletin quotidien sur l'activité solaire et géomagnétique du SIDC

Publié: 2026 Mar 12 1231 UTC

Prévisions SIDC

Éruptions solaires

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

Géomagnétisme

Quiet (A<20 and K<4)

Moniteur de Flux de Proton

Quiet

	Flux de 10 cm	Ap
12 Mar 2026	124	007
13 Mar 2026	120	014
14 Mar 2026	120	012

Régions solaires actives et éruptions solaires

Solar flaring activity was low over the past 24 hours, with only C-class flares identified. The largest flare was a C4.0 flare (SIDC Flare 7173) peaking on March 12 at 10:46 UTC, which was produced by SIDC Sunspot Group 805 (NOAA Active Region 4384, magnetic type Beta). A total of 9 numbered sunspot groups were identified on the disk over the past 24 hours, all having alpha or beta magnetic configuration. 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

No Earth-directed Coronal Mass Ejections (CMEs) have been detected in the available coronagraph images over the past 24 hours.

Trous coronaux

A large positive polarity transequatorial coronal hole (SIDC Coronal Hole 154) is still crossing the central meridian. The associated high-speed stream is expected to arrive at Earth starting late on March 13.

Vent solaire

Over the past 24 hours, solar wind parameters (ACE and DSCOVR) were slow, with the solar wind speed reaching values up to 450 km/s. The interplanetary magnetic field remained weak, below 7 nT, with the Bz reaching a minimum value of - 5nT. Slow solar wind conditions are expected over the next 24 hours, with a chance of a weak enhancement from late on March 13 due to the arrival of a high-speed stream from the large positive polarity coronal hole (SIDC Coronal Hole 154).

Géomagnétisme

Geomagnetic conditions were globally and locally quiet to unsettled (NOAA Kp = 3-, K_bel 2) over the past 24 hours. Mostly quiet to unsettled geomagnetic conditions are expected over the next 24 hours.

Niveaux de flux de protons

The greater than 10 MeV proton flux, as measured by the GOES-19 satellite, was at background levels over the past 24 hours and is likely to remain so in 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 above the 1000 pfu threshold for the main part of the reporting period. The greater than 2 MeV electron flux may exceed the 1000 pfu threshold over the next 24 hours. The electron fluence was at moderate levels and is expected to remain at these levels over the next 24 hours.

Estimation du nombre international de taches solaires (ISN) pour aujourd'hui : 104, sur la base de 21 stations.

Indices solaires pour 11 Mar 2026

Nombre de Wolf, observé par Catania	125
Flux solaire à 10 cm	123
AK Chambon La Forêt	012
AK Wingst	010
Ap estimé	011
Nombre international de taches solaires estimé	116 - Basé sur 20 stations

Résumé des événements marquants

Données fournies par le Solar Influences Data analysis Center© - SIDC - Traité par SpaceWeatherLive