Affichage des archives de vendredi, 27 septembre 2024

Bulletin quotidien sur l'activité solaire et géomagnétique du SIDC

Publié: 2024 Sep 27 1231 UTC

Prévisions SIDC

Éruptions solaires

M-class flares expected (probability >=50%)

Géomagnétisme

Quiet (A<20 and K<4)

Moniteur de Flux de Proton

Quiet

	Flux de 10 cm	Ap
27 Sep 2024	181	007
28 Sep 2024	183	007
29 Sep 2024	185	016

Régions solaires actives et éruptions solaires

Solar flaring activity was moderate over the past 24 hours. A total of 10 numbered sunspot groups were identified on the disk over the past 24 hours. The largest flare was an M1.4 one from NOAA AR 3839, peaking at 23:12 UTC on 26 September. This AR is rotating into view over the east limb. Solar flaring activity is expected to be moderate over the next 24 hours, with M-class flares likely and a small chance for X-class flares.

Éjection de masse coronale

No Earth directed CMEs were observed in the past 24 hours. A partial halo CME with angular width around 150 degrees erupted on 26 September, first seen by LASCO C2 at 09:12 UTC. This event is backsided and will not arrive to the Earth.

Trous coronaux

A small negative polarity coronal hole crossed central meridian on 26 September, a HSS may be expected at the Earth on 29 September.

Vent solaire

The Earth is inside slow solar wind, with speeds around 360 km/s and an interplanetary magnetic field of about 5 nT. Similar conditions can be expected for the next 48 hours.

Géomagnétisme

The geomagnetic conditions over the past 24 hours were mostly quiet both locally and globally (K_Bel and Kp from 1 to 3). Similar conditions can be expected for the next 24 hours.

Niveaux de flux de protons

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

Flux d'électrons sur l'orbite géostationnaire

The greater than 2 MeV electron flux as measured by GOES 18 went slightly above the 1000 pfu threshold on 25 September, while it remained below it in GOES 16. Similar conditions can be expected for the next 24 hours. The 24h electron fluence was at normal levels, and is expected to remain so.

Estimation du nombre international de taches solaires (ISN) pour aujourd'hui : 162, sur la base de 15 stations.

Indices solaires pour 26 Sep 2024

Nombre de Wolf, observé par Catania	184
Flux solaire à 10 cm	181
AK Chambon La Forêt	011
AK Wingst	015
Ap estimé	014
Nombre international de taches solaires estimé	144 - Basé sur 15 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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