Affichage des archives de jeudi, 25 janvier 2018

Bulletin quotidien sur l'activité solaire et géomagnétique du SIDC

Publié: 2018 Jan 25 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
25 Jan 2018	070	009
26 Jan 2018	069	007
27 Jan 2018	069	010

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 crossed a fold in the Heliospheric Current Sheet (HCS) on 24 January. The interplanetary magnetic field (IMF) was mostly directed away from the Sun from 02UT until about 20UT, after which it switched to a mostly towards orientation. Solar wind speed gradually increased from an initial 350 km/s to 400 km/s around 20UT, after which it remained steady in the range of 400-420 km/s. Bz oscillated between -9 and +8 nT, with a longer stretch of mostly negative values between 20-01UT (DSCOVR). A small negative equatorial coronal hole (CH) and the extension of a positive polar CH are transiting the central meridian.

The geomagnetic field was at quiet to unsettled conditions, with an active episode recorded during the 21-24UT interval. Mostly quiet to unsettled conditions with a chance on an active episode are expected for the coming days, in view of possible further crossings of the HCS and the potential arrival of the wind streams associated with the aforementioned CHs around 27 and 28 January.

Estimation du nombre international de taches solaires (ISN) pour aujourd'hui : 000, sur la base de 05 stations.

Indices solaires pour 24 Jan 2018

Nombre de Wolf, observé par Catania	000
Flux solaire à 10 cm	070
AK Chambon La Forêt	019
AK Wingst	011
Ap estimé	010
Nombre international de taches solaires estimé	000 - Basé sur 19 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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