Affichage des archives de vendredi, 20 octobre 2023

Bulletin quotidien sur l'activité solaire et géomagnétique du SIDC

Publié: 2023 Oct 20 1238 UTC

Prévisions SIDC

Éruptions solaires

C-class flares expected, (probability >=50%)

Géomagnétisme

Quiet (A<20 and K<4)

Moniteur de Flux de Proton

Quiet

	Flux de 10 cm	Ap
20 Oct 2023	127	017
21 Oct 2023	125	014
22 Oct 2023	123	015

Régions solaires actives et éruptions solaires

The solar flaring activity was at low levels. The majority of the flaring activity originated from at or beyond the west limb. The three regions on disk, Catania sunspot regions 12, 4 and 9 (NOAA AR 3465, NOAA AR 3464 and NOAA AR 3468) are all simple regions and were quiet. Catania sunspot group 18, is about to rotate over the west limb. The solar flaring activity is expected to be at low levels over the next 24 hours with C-class flares likely.

Éjection de masse coronale

A partial halo Coronal Mass Ejection (CME) directed to the south-east was visible in SOHO/LASCO-C2 data from 15:00 UTC October 19. This determined to be a back-sided event and will not impact Earth. A filament eruption in the south-east quadrant began to lift off at around 18:20 UTC. This produced a narrow CME in SOHO/LASCO-C2 data to the south- east visible from 19:20 UTC but is not expected to be Earth-directed.

Trous coronaux

A small, negative polarity coronal hole in the northern hemisphere continues to transit the central meridian since October 19.

Vent solaire

The solar wind speed ranged between 320km/s and 430 km/s. The interplanetary magnetic field was stable around 5nT for most of the period increasing slightly to 9nT near the end of the period. Bz had a minimum value of -6 nT. The interplanetary magnetic field orientation was predominantly in the positive sector (field directed away from Sun). The solar wind speed is expected to remain slightly enhanced over the next days due to possible new high-speed stream associated with the small negative polarity coronal hole which crossed the central meridian on October 16. Additional further enhancements in the speed and magnetic field may be possible on October 20 to October 22, due to the glancing blows predicted for the CMEs from October 16, 17 and 18.

Géomagnétisme

During last 24 hours the geomagnetic conditions were at quiet to unsettled levels (NOAA KP and K Bel 1-3). Geomagnetic conditions are expected to be at quiet to unsettled levels generally. Active intervals are also possible between October 20 to 22, due to the predicted CME glancing blows and high-speed stream.

Niveaux de flux de protons

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

Flux d'électrons sur l'orbite géostationnaire

The greater than 2 MeV electron flux remained below the 1000 pfu threshold as measured by GOES 16. It is expected to remain below this threshold over the next days. The 24 hour electron fluence was at nominal levels. The electron fluence is expected to be at nominal levels for the next days.

Estimation du nombre international de taches solaires (ISN) pour aujourd'hui : 068, sur la base de 05 stations.

Indices solaires pour 19 Oct 2023

Nombre de Wolf, observé par Catania	060
Flux solaire à 10 cm	129
AK Chambon La Forêt	009
AK Wingst	008
Ap estimé	009
Nombre international de taches solaires estimé	055 - Basé sur 18 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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