Affichage des archives de jeudi, 30 octobre 2025

Bulletin quotidien sur l'activité solaire et géomagnétique du SIDC

Publié: 2025 Oct 30 1231 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
30 Oct 2025	118	031
31 Oct 2025	118	015
01 Nov 2025	118	011

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. A total of 6 numbered sunspot groups were identified on the disk over the past 24 hours. Solar flaring activity is expected to be low over the next 24 hours, with C-class flares likely.

Éjection de masse coronale

A partial halo CME (angular width around 140 degrees) was first seen by LASCO C2 at 04:47 UT on 30 October. This CME is backsided and not expected to arrive to the Earth.

Trous coronaux

There are two coronal holes (SIDC Coronal Hole 123 and 128) on the western hemisphere and one that crossed the central meridian on 29 October (SIDC Coronal Hole 129), all with positive polarity.

Vent solaire

Over the past 24 hours, we observed a high speed stream from SIDC Coronal Hole 123, combined with SIDC Coronal Hole 128. The speeds reached 550 km/s, currently at 500 km/s. The interplanetary magnetic field rose to 13 nT (currently at 12 nT), with positive polarity (away from the Sun). We expect similar conditions in the next 24 hours.

Géomagnétisme

Geomagnetic conditions reached minor storm conditions at planetary levels and (Kp up to 5- and K-Bel: up to 4). In the next 24 hours, active conditions can be expected.

Niveaux de flux de protons

The greater than 10 MeV GOES proton flux was below the 10 pfu threshold level over the past 24 hours and is expected to remain so for 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 below the 1000 pfu threshold. The greater than 2 MeV electron flux is expected to remain below the 1000 pfu threshold over the next 24 hours. The 24-hour electron fluence was at normal levels and is expected to be at normal levels over the next 24 hours.

Estimation du nombre international de taches solaires (ISN) pour aujourd'hui : 064, sur la base de 12 stations.

Indices solaires pour 29 Oct 2025

Nombre de Wolf, observé par Catania	117
Flux solaire à 10 cm	118
AK Chambon La Forêt	040
AK Wingst	025
Ap estimé	026
Nombre international de taches solaires estimé	093 - Basé sur 14 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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