Affichage des archives de dimanche, 17 novembre 2024

Bulletin quotidien sur l'activité solaire et géomagnétique du SIDC

Publié: 2024 Nov 17 1257 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
17 Nov 2024	150	011
18 Nov 2024	150	025
19 Nov 2024	150	011

Régions solaires actives et éruptions solaires

Solar flaring activity was low over the past 24 hours, with only C-class flares identified. The largest flare was a C3.1 flare (SIDC Flare 2619), peaking on November 16 at 22:02 UTC. A total of five numbered sunspot groups were observed on the disk during this period. A new sunspot group has emerged (SIDC Sunspot Group 315, NOAA Active Region 3895), currently located at S03W35, with a Beta magnetic configuration. Additionally, a sunspot group currently located near the eastern limb at approximately 10 degrees latitude south is also very active with several C-class flares. This sunspot group may be the returning SIDC Sunspot Group 272 (NOAA 3843/3868). Solar flaring activity is expected to remain low over the next 24 hours, with C-class flares very likely and a chance for M-class flares.

Éjection de masse coronale

A significant number of large filaments are currently facing Earth. So far, the filaments remain stable, and no Earth- directed coronal mass ejections (CMEs) have been detected in the available coronagraph imagery over the past 24 hours.

Trous coronaux

The SIDC Coronal Hole 78, which first reached the central meridian on 2024-11-14, is now positioned on the western side of the Sun. A new coronal hole (SIDC Coronal Hole 79), a mid-latitude southern coronal hole with negative polarity, has emerged and is also located on the western side of the Sun.

Vent solaire

Over the past 24 hours, solar wind conditions gradually returned to a slow solar wind regime, with wind speeds decreasing to around 325 km/s. The total interplanetary magnetic field remained below 7 nT, and the southward component of the interplanetary magnetic field, Bz, fluctuated between -7 nT and 5 nT. Today, on November 17, around 10:45 UTC, the interplanetary magnetic field orientation shifted from "away from the Sun" (phi-angle positive) to "towards the Sun" (phi-angle negative). This change may be due to the crossing of a sector boundary. Following this rotation, the total interplanetary magnetic field slightly increased, ranging between 7 nT and 8 nT, while the southward component, Bz, was predominantly negative, fluctuating between -7 nT and 0 nT. On November 18, high-speed streams associated with Coronal Hole 78, an equatorial coronal hole with positive polarity that first reached the central meridian on 2024-11-14 and is now located on the western side of the Sun, may reach Earth and impact solar wind conditions.

Géomagnétisme

Geomagnetic conditions over the past 24 hours were mostly quiet (NOAA Kp 1-2, K BEL 1-3). Geomagnetic activity is expected to remain quiet to unsettled. However, on November 18, periods of active or minor storm conditions are anticipated in response to the arrival of high-speed streams associated with Coronal Hole 78, an equatorial coronal hole with positive polarity that first reached the central meridian on 2024-11-14.

Niveaux de flux de protons

The greater than 10 MeV GOES proton flux remained below the 10 pfu threshold over the past 24 hours. It is expected to stay below this threshold level over the next 24 hours. Due to the enhanced solar and flaring activity, a slight chance of an increase cannot be fully excluded.

Flux d'électrons sur l'orbite géostationnaire

The greater than 2 MeV electron flux measured by GOES 16 was below the 1000 pfu threshold and is expected to remain so in the upcoming days. The 24h electron fluence was at nominal level and is expected to remain so in the next days.

Estimation du nombre international de taches solaires (ISN) pour aujourd'hui : 089, sur la base de 09 stations.

Indices solaires pour 16 Nov 2024

Nombre de Wolf, observé par Catania	///
Flux solaire à 10 cm	140
AK Chambon La Forêt	008
AK Wingst	006
Ap estimé	007
Nombre international de taches solaires estimé	071 - Basé sur 09 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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