Affichage des archives de samedi, 1 novembre 2025

Bulletin quotidien sur l'activité solaire et géomagnétique du SIDC

Publié: 2025 Nov 01 1231 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
01 Nov 2025	125	016
02 Nov 2025	125	013
03 Nov 2025	125	014

Régions solaires actives et éruptions solaires

Solar flaring activity was low over the past 24 hours, with only C-class flares identified. A total of 3 numbered sunspot groups were identified on the disk over the past 24 hours. The largest flare was a C7.1 flare (SIDC Flare 5887) peaking on October 31 at 20:43 UTC, from a region rotating into view over the east limb. This region has been producing important flares and CMEs in the last days, so we expect solar activity to increase due to it, C-class flares can be expected and M-class flares are likely.

Éjection de masse coronale

A wide CME erupted towards the east first seen by LASCO C2 at 08:48 UTC on 31 October. This CME was followed by a second one at 20:12 UTC towards the NE. Both CMEs were backsided and will not arrive to the Earth.

Trous coronaux

There are three positive polarity CHs in the western hemisphere. SIDC Coronal Hole 123 is the largest, located in the south. SIDC Coronal Hole 128 is smaller and located at the equator. Finally, SIDC Coronal Hole 129 has a considerable size and is located in the northern hemisphere.

Vent solaire

The solar wind speed has decreased to about 500 km/s, under the waning influence of the HSS from SIDC Coronal Hole 123, the interplanetary magnetic field is around 6 nT. We expect a gradual return to slow solar wind in the next 24 hours. Nevertheless, we may see instead the arrival of the high speed solar wind from SIDC Coronal Hole 129, located in the northern hemisphere (also positive polarity). This coronal hole is located above 20 degrees latitude, meaning that its HSS may miss the Earth. There is also a possible arrival, in the next 24 hours of the CME from 28 October (SIDC CME 589), but this will be a weak event.

Géomagnétisme

Geomagnetic conditions reached active levels (Kp and K_Bel up to 4). In the next 24 hours, active to minor storm conditions can be expected if the HSS from SIDC Coronal Hole 129 and the CME from 28 October (SIDC CME 589) arrive.

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 above the 1000 pfu threshold after 12:00 UTC on 31 October. The greater than 2 MeV electron flux is expected to remain above the 1000 pfu threshold over the next 24 hours. The 24-hour electron fluence was at normal levels, but increasing, it is expected to reach moderate levels over the next 24 hours.

Estimation du nombre international de taches solaires (ISN) pour aujourd'hui : 023, sur la base de 06 stations.

Indices solaires pour 31 Oct 2025

Nombre de Wolf, observé par Catania	033
Flux solaire à 10 cm	125
AK Chambon La Forêt	025
AK Wingst	028
Ap estimé	026
Nombre international de taches solaires estimé	044 - 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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