Affichage des archives de dimanche, 21 avril 2019

Bulletin quotidien sur l'activité solaire et géomagnétique du SIDC

Publié: 2019 Apr 21 1230 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
21 Apr 2019	069	004
22 Apr 2019	069	003
23 Apr 2019	068	006

Bulletin

Solar activity was at very low levels. Small active region NOAA 2739 decayed further and is expected to become spotless later today. CACTus revealed a coronal mass ejection (CME) from the west limb starting around 05:00UT in LASCO/C2 coronagraphic images. This CME was most likely associated with eruptive processes in NOAA 2738 from behind the west limb, as evident from SDO EUV imagery. None of the observed CMEs had an earth- directed component. The greater than 10 MeV proton flux was at nominal values. An equatorial negative polarity coronal hole (CH) is transiting the central meridian.

Solar activity is expected to remain at very low levels.

Solar wind speed was fairly steady between mostly 320 and 350 km/s (DSCOVR). Bz varied between -5 and +4 nT. The interplanetary magnetic field was predominantly directed away from the Sun (positive sector). Geomagnetic conditions were at quiet levels, with an isolated unsettled interval (06-09UT) recorded at Dourbes.

Mostly quiet geomagnetic conditions are expected, with a chance on an isolated unsettled episode. Late on 23 or on 24 April, geomagnetic activity is expected to increase following the arrival of the wind stream from an equatorial negative polarity coronal hole.

Estimation du nombre international de taches solaires (ISN) pour aujourd'hui : 007, sur la base de 25 stations.

Indices solaires pour 20 Apr 2019

Nombre de Wolf, observé par Catania	///
Flux solaire à 10 cm	070
AK Chambon La Forêt	008
AK Wingst	///
Ap estimé	005
Nombre international de taches solaires estimé	012 - Basé sur 31 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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