Affichage des archives de vendredi, 20 mars 2026

Bulletin quotidien sur l'activité solaire et géomagnétique du SIDC

Publié: 2026 Mar 20 1241 UTC

Prévisions SIDC

Éruptions solaires

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

Géomagnétisme

Moderate (ISES: Major) magstorm expected (A>=50 or K=6)

Moniteur de Flux de Proton

Quiet

	Flux de 10 cm	Ap
20 Mar 2026	105	035
21 Mar 2026	104	039
22 Mar 2026	104	035

Régions solaires actives et éruptions solaires

Solar flaring activity was very low over the past 24 hours. The X-ray flux was below C level. There are currently 2 numbered regions on the disk: SIDC Sunspot Group 820 (NOAA Active Region 4392 magnetic type beta) and SIDC Sunspot Group 825 (NOAA Active Region 4397) both of these regions were stable over the period. SIDC Sunspot Group 819 (NOAA active region 4393) decayed to a plage region. Solar flaring activity is expected to be low over the next 24 hours, with C-class flares expected

Éjection de masse coronale

No new Earth directed CMEs were detected in the available coronagraph imagery.

Trous coronaux

The southern midlatitude extension of the large positive polarity coronal hole (SIDC Coronal Hole 154) continues to cross the central meridian. The extended negative polarity equatorial coronal hole (SIDC Coronal Hole 147) also continues to transit the central meridian.

Vent solaire

Over the past 24 hours, the solar wind parameters reflected slow solar wind conditions until around 01:30 UTC on March 20 when the magnetic field and solar wind speed began to increase, indicating the arrival of an ICME. The solar wind speed increased from around 330 km/s to 470 km/s. The total magnetic field increased from 5 nT to a maximum of 19nT at 11:40 UTC March 20. Bz had a minimum value of -11 nT at 04:45 UTC but was predominantly positive. The interplanetary magnetic field phi angle was mostly in the positive sector (directed towards the Sun). Continued enhanced solar wind conditions are expected on March 20 due to the ongoing ICME influence. From late on March 20 and March 21 the solar wind conditions are expected to become further enhanced due to two further predicted CME arrivals from March 17 and 18, combined with a possible sector boundary crossing and high speed stream arrival.

Géomagnétisme

Over the past 24 hours, the geomagnetic conditions were at quiet levels on March 19. Om March 20 between 06:00 and 12:00 UTC Active conditions were reached (NOAA KP 4- and K BEL 4), in response to the ICME arrival. Minor to moderate storm conditions are expected March 20 due to the ongoing ICME influence in addition to the further CME arrivals and influence from the sector boundary crossing, with a slight chance for major storm conditions due to these combined effects.

Niveaux de flux de protons

The greater than 10 MeV proton flux was below the 10 pfu threshold over the past 24 hours. It is expected to remain below this threshold level 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 satellites, exceeded the 1000 pfu threshold and reached a maximum of 4941 pfu. From 05:00 UTC March 20 the flux returned below the threshold. The greater than 2 MeV electron flux is expected to remain below the 1000 pfu threshold over the next 24 hours. The electron fluence was at moderate levels and is expected to be at low to moderate levels for the next 24 hours.

Estimation du nombre international de taches solaires (ISN) pour aujourd'hui : 031, sur la base de 17 stations.

Indices solaires pour 19 Mar 2026

Nombre de Wolf, observé par Catania	///
Flux solaire à 10 cm	106
AK Chambon La Forêt	005
AK Wingst	002
Ap estimé	002
Nombre international de taches solaires estimé	036 - Basé sur 33 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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