Affichage des archives de lundi, 19 avril 2021

Bulletin quotidien sur l'activité solaire et géomagnétique du SIDC

Publié: 2021 Apr 19 1300 UTC

Prévisions SIDC

Éruptions solaires

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

Géomagnétisme

Quiet (A<20 and K<4)

Moniteur de Flux de Proton

Quiet

	Flux de 10 cm	Ap
19 Apr 2021	078	016
20 Apr 2021	076	013
21 Apr 2021	075	009

Bulletin

There are presently several active regions observed on the visible side of the Sun, majority of them have very simple configuration of the photospheric magnetic field. The most complex one is Catania sunspot group 87 (NOAA AR 2816) which has beta configuration of its photospheric magnetic field. Solar flaring activity is low, with only few B-class and no C-class flares reported during last 24 hours. Majority of the observed flares originated from the active region that is rotating from behind of the East solar limb. This region was also source of the fast CME reported yesterday. We expect such a low level of flaring activity to persist in the coming hours, with an isolated C-class flares possible but not very probable. During last 24 hours no Earth directed CMEs were observed in coronagraph data, and the proton flux levels remained at background values.

The greater than 2MeV electron flux crossed the 1000 pfu threshold this morning and it is expected to remain above the threshold for long periods throughout April 19th.

The high solar wind speed and the longer interval of the negative value of the Bz componente of the interplanetary magnetic field induced active conditions … The local station at Dourbes reported longer interval of the Kp=4 at around midnight, while NOAA reported also several intervals of the Planetary K-index, K=4. The solar wind speed is still high and longer intervals of the negative Bz component of the interplanetary magnetic field might result in disturbed geomagnetic conditions, with active to minor storm conditions possible in the coming hours.

Estimation du nombre international de taches solaires (ISN) pour aujourd'hui : 033, sur la base de 20 stations.

Indices solaires pour 18 Apr 2021

Nombre de Wolf, observé par Catania	///
Flux solaire à 10 cm	078
AK Chambon La Forêt	025
AK Wingst	020
Ap estimé	020
Nombre international de taches solaires estimé	017 - Basé sur 25 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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