Affichage des archives de samedi, 17 avril 2021

Bulletin quotidien sur l'activité solaire et géomagnétique du SIDC

Publié: 2021 Apr 17 1231 UTC

Prévisions SIDC

Éruptions solaires

Quiet conditions (<50% probability of C-class flares)

Géomagnétisme

Minor storm expected (A>=30 or K=5)

Moniteur de Flux de Proton

Quiet

	Flux de 10 cm	Ap
17 Apr 2021	077	032
18 Apr 2021	078	018
19 Apr 2021	077	011

Bulletin

Solar activity remained at very low levels over the last 24 hours. Three numbered sunspot groups are visible on the solar disk, namely Catania 86 (NOAA 2814), NOAA 2815 and NOAA 2016. All of them are classified as magnetic type Beta and have shown low levels of activity with B-class flaring. The flaring activity within the next 24 hours is expected to remain low with 30% chance for C-class flares.

No Earth-directed coronal mass ejections (CMEs) were detected in the available coronagraph imagery.

The greater than 10 MeV proton flux was at nominal levels in the past 24 hours and is expected to remain so in the next 24 hours. The greater than 2MeV electron flux remained under the 1000 pfu threshold and is expected to show some enhancement. The 24h electron fluence was at nominal levels and is expected to be at nominal to moderate levels in the next 24 hours.

Over the past 24 hours the solar wind parameters (ACE and DSCOVR) were elevated with the arrival of the high speed stream (HSS) from the high- latitude extension of the negative-polarity polar coronal hole. The total magnetic field registered a magnitude of 13 nT with a minimum Bz of -11 nT. The solar wind speed varied between 400 km/s and 610 km/s. The solar wind speed is expected to remain elevated throughout April 17th.

Due to the HSS and prolonged intervals with negative Bz multiple periods with minor geomagnetic storms were registered over the past 24 hours. Unsettled to active geomagnetic conditions with more periods of minor geomagnetic storms can be expected for the next 24 hours.

Estimation du nombre international de taches solaires (ISN) pour aujourd'hui : 019, sur la base de 21 stations.

Indices solaires pour 16 Apr 2021

Nombre de Wolf, observé par Catania	///
Flux solaire à 10 cm	077
AK Chambon La Forêt	038
AK Wingst	020
Ap estimé	020
Nombre international de taches solaires estimé	037 - Basé sur 26 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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