Affichage des archives de samedi, 19 août 2023

Bulletin quotidien sur l'activité solaire et géomagnétique du SIDC

Publié: 2023 Aug 19 1231 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
19 Aug 2023	150	014
20 Aug 2023	148	009
21 Aug 2023	146	006

Régions solaires actives et éruptions solaires

The solar flaring activity was at low levels. The largest flare was an impulsive C5.8 flare peaking at 06:48 UTC on August 19, associated with NOAA AR3406. NOAA AR 3409 was also active, producing minor C-class flares. A new region rotated over the north-east limb, numbered NOAA AR3412. This and the remaining regions were mostly stable and quiet. The solar flaring activity is expected to be at low levels over the next 24 hours with C-class flares likely and a low chance for isolated M-class flares.

Éjection de masse coronale

There were no Earth-directed Coronal Mass Ejections (CMEs) detected in the available coronagraph observations

Trous coronaux

A small negative polarity coronal hole in the northern hemisphere began to traverse the central meridian on August 18.

Vent solaire

The solar wind parameters reflected the ongoing weak negative polarity high speed stream influence. The interplanetary magnetic field decreased from 11nT to near 3nT. Bz had a minimum value of -7nT. The solar wind speed ranged between 450km/s and 530 km/s. The interplanetary magnetic field orientation was predominantly in the negative sector (field directed towards the Sun). The solar wind parameters are expected to remain enhanced on August 19, while the Earth remains under the influence for the high- speed stream, slowly returning to nominal conditions on August 20.

Géomagnétisme

During last 24 hours the geomagnetic conditions were at quiet to unsettled levels globally (NOAA KP 1-3) with active intervals locally (K-Bel 1-3). Geomagnetic conditions are expected to be at unsettled levels, with active periods possible on August 19 due to the ongoing high speed stream influence.

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 : 133, sur la base de 09 stations.

Indices solaires pour 18 Aug 2023

Nombre de Wolf, observé par Catania	///
Flux solaire à 10 cm	151
AK Chambon La Forêt	020
AK Wingst	012
Ap estimé	012
Nombre international de taches solaires estimé	125 - Basé sur 21 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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