Affichage des archives de mercredi, 19 mai 2021

Bulletin quotidien sur l'activité solaire et géomagnétique du SIDC

Publié: 2021 May 19 1231 UTC

Prévisions SIDC

Éruptions solaires

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

Géomagnétisme

Active conditions expected (A>=20 or K=4)

Moniteur de Flux de Proton

Quiet

	Flux de 10 cm	Ap
19 May 2021	077	016
20 May 2021	079	007
21 May 2021	079	007

Bulletin

Two active regions (ARs) visible on the disk, NOAA AR 2822 (alpha magnetic field configuration) and AR 2824 (beta magnetic field configuration). Only B-class flares in past 24 hours. C-class flares are possible.

No Earth-directed Coronal Mass Ejections (CMEs) have been detected in the available coronagraphic imagery in the last 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 remained below the 1000 pfu in the past 24 hours and is expected to remain so. The 24-hour electron fluence was at normal levels in the past 24 hours and is expected to remain so.

In the last 24 hours, the solar wind speed varied between 350 and 400 km/s. The interplanetary magnetic field reached 9 nT with Bz mostly positive. The interplanetary magnetic field polarity was negative (towards the Sun). The high speed solar wind from the coronal hole that crossed the central meridian on 15 May is expected to arrive to the Earth today.

Geomagnetic conditions have been mostly quiet (KDourbes 0-3, Kp 1-2). Active conditions can be expected when the high speed solar wind stream arrives to the Earth today.

Estimation du nombre international de taches solaires (ISN) pour aujourd'hui : 026, sur la base de 23 stations.

Indices solaires pour 18 May 2021

Nombre de Wolf, observé par Catania	///
Flux solaire à 10 cm	076
AK Chambon La Forêt	010
AK Wingst	012
Ap estimé	012
Nombre international de taches solaires estimé	028 - Basé sur 32 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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