Affichage des archives de lundi, 23 mars 2026

Bulletin quotidien sur l'activité solaire et géomagnétique du SIDC

Publié: 2026 Mar 23 1318 UTC

Prévisions SIDC

Éruptions solaires

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

Géomagnétisme

Active conditions expected (A>=20 or K=4)

Moniteur de Flux de Proton

Quiet

	Flux de 10 cm	Ap
23 Mar 2026	120	014
24 Mar 2026	118	015
25 Mar 2026	116	010

Régions solaires actives et éruptions solaires

Solar flaring activity was low over the past 24 hours, with only two C-class flares identified. SIDC Sunspot Group (SG) 820 (NOAA Active Region [AR] 4392, Beta magnetic configuration) and SIDC SG 831 (NOAA AR 4402, Beta magnetic configuration) produced a single triple-peaked, C3, flare (SIDC flare 7241) that peaked on 23 Mar at 00:12 UTC. SIDC SG 830 (NOAA AR 4401, Beta magnetic configuration) produced the second flare of the past 24 hours, a C1 on 23 Mar at 09:50 UTC. C-class flaring activity is expected to continue in the next 24 hours.

Éjection de masse coronale

A Coronal Mass Ejection (CME) seen in LASCO-C2 images as launched on 22 Mar at 16:00 UTC is associated with a complex filament eruption and has a northern component that can possibly become geo-effective. Either the CME itself, or a glancing blow from it, is estimated to arrive on Earth the first half of 25 Mar and have a relatively minor impact. A CME seen in LASCO-C2 images as launched on 23 Mar at 00:00 UTC is expected to deliver a glancing blow on the first half of 26 Mar.

Vent solaire

The Solar Wind (SW) conditions remain strongly affected by a High Speed Stream (HSS) during the past 24 hours. The SW speed ranged between 650 and 700 km/s, while the interplanetary magnetic field (B) dropped from 13 nT to 3 nT, and its North-South component (Bz) increased from -12 nT to close to zero nT. For the next 24 hours a similar pattern is expected for the SW speed, while the magnetic field is expected to vary at around 5 nT.

Géomagnétisme

During the past 24 hours the global geomagnetic conditions reached the major storm levels (NOAA Kp 7- at 15:00 - 18:00 UTC) and moderate storm levels (NOAA Kp 6+ at 18:00 - 24:00 UTC and NOAA Kp 6 at 12:00 - 15:00 UTC) on 22 Mar. The local conditions followed a similar pattern during the same period of time but were milder. K BEL reached moderate storm levels (6) at 18:00-21:00 UTC and minor storm levels (5) at 15:00-18:00 UTC and 21:00-24:00 UTC. As the interplanetary magnetic field strength has became much weaker, the geomagnetic conditions are expected to drop, both globally and locally, to active or unsettled levels in 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 as measured by GOES 19 was around the 1000 pfu threshold level during the past 24 hours. It is expected to marginally increase in the next 24 hours and remain around the threshold alert level. The 24-hour electron fluence was at normal levels during the past 24 hours. It is expected to reach moderate levels at some point in the next 24 hours.

Estimation du nombre international de taches solaires (ISN) pour aujourd'hui : 112, sur la base de 17 stations.

Indices solaires pour 22 Mar 2026

Nombre de Wolf, observé par Catania	///
Flux solaire à 10 cm	120
AK Chambon La Forêt	079
AK Wingst	075
Ap estimé	072
Nombre international de taches solaires estimé	109 - 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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