Affichage des archives de lundi, 5 septembre 2022

Bulletin quotidien sur l'activité solaire et géomagnétique du SIDC

Publié: 2022 Sep 05 1234 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
05 Sep 2022	125	019
06 Sep 2022	123	012
07 Sep 2022	120	006

Bulletin

Solar flaring activity was low but frequent during the last 24 hours with several C-class flares detected. Both NOAA Active Regions (AR) 3089 and 3092 produced numerous C-class flares, with the brightest being a C8 at 4 September 16:38 UTC, associated with NOAA AR 3089. NOAA AR 3092 is expected to continue its C-class flare activity, while NOAA AR 3089 is turning away from Earth's view and its flaring activity is likely to become invisible from Earth in the next 24 hours.

No Earth-directed coronal mass ejections (CME) were detected in the available coronagraph imagery over the past 24 hours.

The greater than 10 MeV proton flux was at nominal levels over the past 24 hours and is expected to remain so for the next 24 hours. The greater than 2 MeV electron flux exceeded the 1000 pfu threshold for several hours during the last 24 hours as a result of the arrival of the high speed stream. In the next 24 hours it is expected to reach again the 1000 pfu threshold level, but for a shorter period. The 24h electron fluence reached moderate levels during the last 24 hours and is expected to gradually return to nominal levels in the next 24 hours.

During the last 24 hours the Solar Wind (SW) conditions featured a gradual return to a slow SW regime, following the arrival of a High Speed Stream (HSS) that arrived on 3 Sep. The SW speed dropped from 720 to 550 km/s in the last 24 hours. The total magnetic field (Bt) also dropped from 10 to 6 nT, while its Bz component ranged between -10 to 8 nT. The interplanetary magnetic field phi angle was directed away from the Sun during the last 24 hours. The SW conditions are expected to gradually return to a typical slow SW regime in the next 24 hours.

Geomagnetic conditions reached globally moderate storm levels (Kp=6) on 4 Sep between 15:00 and 18:00 UTC, in response to the arrival of the HSS on 3 Sep. Minor storm levels (Kp=5) were observed between 12:00 and 15:00 UTC on 3 Sep and again between 21:00 UTC 3 Sep and 06:00 UTC today. For the rest of the last 24 hours the conditions were at active levels (Kp=4). A gradual return to moderate levels (Kp=3) is expected for the next 24 hours.

Estimation du nombre international de taches solaires (ISN) pour aujourd'hui : 081, sur la base de 15 stations.

Indices solaires pour 04 Sep 2022

Nombre de Wolf, observé par Catania	///
Flux solaire à 10 cm	128
AK Chambon La Forêt	///
AK Wingst	///
Ap estimé	051
Nombre international de taches solaires estimé	068 - 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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