Affichage des archives de samedi, 14 septembre 2024

Bulletin quotidien sur l'activité solaire et géomagnétique du SIDC

Publié: 2024 Sep 14 1232 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
14 Sep 2024	182	020
15 Sep 2024	178	015
16 Sep 2024	176	011

Régions solaires actives et éruptions solaires

Solar flaring activity was high with four M-class flares detected over the past 24 hours. NOAA Active Region (AR) 3825 (magnetic configuration Beta-Gamma, Catania sunspot group no 1) produced all four of these flares: an M1.2 at 13 Sep 15:08 UTC, an M1.4 at 13 Sep 17:56 UTC, an M1.1 at 13 Sep 20:49 UTC, and an M3.0 at 14 Sep 07:41. A fifth peak at M1.1 level was registered by GOES-18 as lasting form 14 Sep 03:10 to 07:22 UTC, however this is most likely not a single event but the combination of numerous C-class flares in close succession. More M-class flaring activity is expected in the next 24 hours, mostly from NOAA AR 3825.

Éjection de masse coronale

A partial halo Coronal Mass Ejection (CME) can be seen in LASCO C2/SOHO images starting from 13 Sep 01:30. This event is associated with an M1.6 flare located at the west solar limb and has an estimated speed of 1250 km/s. A glancing blow is expected to affect the Earth's atmosphere early on 15 Sep. Two back-sided CME can also been seen in LASCO C2/SOHO images starting from 12 Sep 21:30 UTC and 13 Sep 10:10 UTC. As back-sided events, they are not expected to affect Earth.

Vent solaire

Solar Wind (SW) conditions are gradually returning to a slow SW regime. During the past 24 hours the SW speed dropped from 570 km/s to 380 km/s, while the total interplanetary magnetic field (Bt) ranged between 4 nT and 10 nT. The North-South component of the magnetic field (Bz) varied between -10 and 6 nT and the interplanetary magnetic field phi angle was directed predominately away from the Sun. A High Speed Stream (HSS) is expected to disturb the SW conditions in the next 24 hours.

Géomagnétisme

The global geomagnetic conditions reached moderate major storm levels (NOAA Kp 6) during the 13 Sep 21:00-24:00 UTC period. For the rest of the past 24 hours NOAA Kp varied between Kp 3+ and Kp 4+ (unsettled to active). The local geomagnetic conditions were milder and reached minor storm levels (K BEL 5) during the 14 Sep 00:00-03:00 UTC period. For the rest of the past 24 hours conditions ranged between quiet (K BEL 2) and active (K BEL 3) levels. A High Speed Stream (HSS) is expected to become geo-effective in the next 24 hours, but the effect to the geomagnetic conditions is likely to be minor. Unsettled to active conditions are expected to prevail both locally and globally.

Niveaux de flux de protons

The greater than 10 MeV proton flux, as measured by GOES-18, was at nominal levels over the past 24 hours and is expected to remain so.

Flux d'électrons sur l'orbite géostationnaire

The greater than 2 MeV electron flux, as measured by the GOES-18 satellite, exceeded the 1000 pfu threshold for most of the 13 Sep 15:50 UTC to 14 Sep 04:55 UTC period. The peak of the flux was observed to be 7000 pfu at 13 Sep 20:30 UTC. The greater than 2 MeV electron flux is expected to be at increased levels but below the alert threshold level in the next 24 hours. The 24h electron fluence increased significantly during the past 24 hours, however it remained at normal levels (ie below the 5e7 pfu threshold). For the next 24 hours it is expected to remain at normal levels.

Estimation du nombre international de taches solaires (ISN) pour aujourd'hui : 118, sur la base de 15 stations.

Indices solaires pour 13 Sep 2024

Nombre de Wolf, observé par Catania	131
Flux solaire à 10 cm	186
AK Chambon La Forêt	040
AK Wingst	032
Ap estimé	033
Nombre international de taches solaires estimé	120 - Basé sur 24 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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