Affichage des archives de mercredi, 17 août 2016

Bulletin quotidien sur l'activité solaire et géomagnétique du SIDC

Publié: 2016 Aug 17 1253 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
17 Aug 2016	085	008
18 Aug 2016	083	014
19 Aug 2016	081	007

Bulletin

Solar activity is very low. No C flares or CMEs were observed. Five active regions are presently observed on the visible side of the solar disc. Their photospheric magnetic field configuration is simple (beta and alpha configuration). The low latitude coronal hole reached central meridian around 00:00 UT today (17-Aug-2016). Solar proton flux intensity is expected to lie within the background levels. No large flares expected (although C-class flares are possible).

The solar wind speed measured by DSCOVR is slowly increasing and it presently amounts about 420 km/s, probably due to the arrival of the fast solar wind from the low latitude coronal hole, which reached central meridian yesterday afternoon. The magnitude of the Interplanetary Magnetic Field (Bt) first was around 5 nT until it started fluctuating between about 5 and 12 nT since 19:00 UT yesterday (16-Aug-2016). In the past 24 hours, geomagnetic conditions have been quiet (K Dourbes between 1 and 3; NOAA Kp between 1 and 3). Active to minor geomagnetic storm conditions (K Dourbes = 3-4) are possible from tomorrow (18-Aug-2016) due to the expected arrival of a high speed stream associated with a negative coronal hole. A return to quiet to unsettled geomagnetic conditions is expected 19-Aug-2016.

Estimation du nombre international de taches solaires (ISN) pour aujourd'hui : 058, sur la base de 25 stations.

Indices solaires pour 16 Aug 2016

Nombre de Wolf, observé par Catania	///
Flux solaire à 10 cm	087
AK Chambon La Forêt	015
AK Wingst	006
Ap estimé	007
Nombre international de taches solaires estimé	081 - Basé sur 35 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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