Affichage des archives de mercredi, 19 mars 2025

Bulletin quotidien sur l'activité solaire et géomagnétique du SIDC

Publié: 2025 Mar 19 1250 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
19 Mar 2025	183	013
20 Mar 2025	179	016
21 Mar 2025	175	013

Régions solaires actives et éruptions solaires

A total of 12 numbered sunspot groups were identified on the disk over the past 24 hours Solar flaring activity was low over the past 24 hours, with only C-class flares identified. The largest flare was a C2.1 flare (SIDC Flare 3875) peaking on March 18 at 21:12 UTC, which was produced by SIDC Sunspot Group 405 (NOAA Active Regions 3996, 4028). SIDC Sunspot Groups 405 and 440 (NOAA Active Region 4028 and 4031) are the most complex regions on disk with Beta-Gamma magnetic configuration. SIDC Sunspot Group 428 (NOAA Active Region 4019) has started to rotate over the west limb. 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

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

Trous coronaux

SIDC Coronal Hole 93 (equatorial coronal hole with a negative polarity) started to cross the central meridian on March 19.

Vent solaire

In the past 24 hours solar wind conditions at Earth became disturbed, due to the arrival of a high-speed stream (HSS). The total interplanetary magnetic ranged from 5 nT to 13 nT, with the Bz component reaching a minimum of -11 nT. The solar wind speed, as measured by ACE, ranged from 350 km/s to 570 km/s. There was a data gap in ACE solar wind data between 00 UTC and 06 UTC. The phi-angle was mainly in the negative sector (directed towards the Sun) with periods in the positive sector. The solar wind conditions are expected to remain disturbed in the next 24 hours due to the ongoing influence of the HSS and the possible arrival of a CME that left the Sun on March 17.

Géomagnétisme

The geomagnetic conditions over the past 24 hours globally and locally reached active conditions (Kp 4 K & BEL 4). Active conditions are expected for the next 24 hours.

Niveaux de flux de protons

Over the past 24 hours, the greater than 10 MeV GOES proton flux was at background levels and is expected to remain so over the next days.

Flux d'électrons sur l'orbite géostationnaire

The greater than 2 MeV electron flux, as measured by GOES-18 satellites, exceeded the 1000 pfu threshold between 17:05 UTC and 17:15 UTC and between 20:25 UTC and 20:55 UTC on March 18. The electron flux is expected to remain below the threshold in the coming 24 hours. The 24h electron fluence is presently at normal level, and it is expected to remain so in the next 24 hours.

Estimation du nombre international de taches solaires (ISN) pour aujourd'hui : 167, sur la base de 16 stations.

Indices solaires pour 18 Mar 2025

Nombre de Wolf, observé par Catania	///
Flux solaire à 10 cm	184
AK Chambon La Forêt	022
AK Wingst	013
Ap estimé	014
Nombre international de taches solaires estimé	193 - Basé sur 22 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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