Affichage des archives de lundi, 17 mars 2025

Bulletin quotidien sur l'activité solaire et géomagnétique du SIDC

Publié: 2025 Mar 17 1237 UTC

Prévisions SIDC

Éruptions solaires

M-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
17 Mar 2025	190	016
18 Mar 2025	194	013
19 Mar 2025	198	005

Régions solaires actives et éruptions solaires

Solar flaring activity was low over the past 24 hours, with C-class flares identified. The largest flare was a C7.8 flare peaking on March 17 at 05:42 UTC, which was produced by SIDC Sunspot Group 405 (NOAA Active Region 4028). This region along with SIDC Sunspot Groups 436 and SIDC 440 (NOAA Active Region 4025 and 4031) are the largest and most complex regions on disk. There are currently a total of 13 numbered sunspot groups on disk. Solar flaring activity is expected to be moderate over the next 24 hours, with C-class flares expected and M-class flares likely.

Éjection de masse coronale

An eruption seen in SDO/AIA imagery from 08:52 UTC in the northern hemisphere is likely associated with a faint Coronal Mass Ejection seen in SOHO/LASCO-C2 data from 10:50 UTC March 16. This CME is directed to the north-west and predominantly above the sun Earth and is therefore not expected to impact Earth. A faint partial halo CME was observed to the north-east first seen in SOHO/LASCO-C2 data from 20:12 UTC March 16, coinciding with a narrower CME to the north. Initial analysis suggested the narrower CME maybe associated with an on disk eruption while the partial halo may be associated with a back-sided event.

Vent solaire

The solar wind conditions reflected the waning high speed stream influence. The solar wind speed decreased from 450 to 400 km/s. The interplanetary magnetic field ranged between 5 and 7 nT with a minimum Bz value of -5 nT. The solar wind speed is expected to be slightly elevated on March 17 and 18, due to the influence of the high-speed stream associated with the negative polarity coronal hole which began to cross the central meridian March 13.

Géomagnétisme

In the past 24 hours, geomagnetic conditions were quiet to unsettled (Kp = 3) with an isolated active period as measured by K bel. Geomagnetic conditions are expected to be at quiet to unsettled levels with intervals of active periods possible on March 17 and 18 due to the continued possible high-speed stream effects.

Niveaux de flux de protons

The greater than 10 MeV proton flux as measured by GOES-18 remained below the 10 pfu threshold and is expected to remain so over the next days.

Flux d'électrons sur l'orbite géostationnaire

The greater than 2 MeV electron flux exceeded the 1000 pfu threshold for most the past 24 hours and is expected to be above the threshold during the next 24 hours. The 24h electron fluence was at moderate levels and is expected to remain so.

Estimation du nombre international de taches solaires (ISN) pour aujourd'hui : 199, sur la base de 08 stations.

Indices solaires pour 16 Mar 2025

Nombre de Wolf, observé par Catania	///
Flux solaire à 10 cm	186
AK Chambon La Forêt	019
AK Wingst	011
Ap estimé	011
Nombre international de taches solaires estimé	205 - Basé sur 21 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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