Affichage des archives de mardi, 20 mars 2018

Bulletin quotidien sur l'activité solaire et géomagnétique du SIDC

Publié: 2018 Mar 20 1230 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
20 Mar 2018	069	009
21 Mar 2018	068	011
22 Mar 2018	068	011

Bulletin

Solar activity was at very low levels. The Sun is spotless. No earth-directed coronal mass ejections (CMEs) were observed in available coronagraphic imagery. The greater than 10 MeV proton flux was at nominal levels.

Solar activity is expected to remain at very low levels.

Earth is gradually exiting the high speed stream (HSS) from a negative polarity coronal hole (CH). During the period, solar wind speed decreased from 520 km/s to 450 km/s (DSCOVR). Bz oscillated between -4 and +4 nT, with a short-lived excursion to -6 nT around 19UT. The interplanetary magnetic field was mostly directed towards the Sun. Geomagnetic activity ranged from quiet to unsettled, with local K indices (Wingst, Niemegk) reaching active levels during the 21-24UT interval.

Over the next few days, quiet to unsettled conditions are expected with a chance on an active episode from wind streams associated with the patchy equatorial CHs and the leading extension from the negative polarity southern polar CH. The chance on an isolated minor storming interval is likely to increase by 24-25 March with the expected arrival of the wind stream related to the more prominent trailing extension from the southern polar CH.

Estimation du nombre international de taches solaires (ISN) pour aujourd'hui : 000, sur la base de 17 stations.

Indices solaires pour 19 Mar 2018

Nombre de Wolf, observé par Catania	000
Flux solaire à 10 cm	070
AK Chambon La Forêt	024
AK Wingst	017
Ap estimé	019
Nombre international de taches solaires estimé	000 - Basé sur 23 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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