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Tägliches Bulletin zur solaren und geomagnetischen Aktivität des SIDC

Ausgestellt: 2017 Dec 20 1230 UTC

Vorhersage des SIDC

Sonneneruptionen

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

Geomagnetismus

Quiet (A<20 and K<4)

Sonnenprotonen

Quiet

	10cm Fluss	Ap
20 Dec 2017	070	008
21 Dec 2017	071	016
22 Dec 2017	071	007

Bulletin

Solar activity was very low with only a couple of low level B class flares from the only region on disk Catania sunspotgroup 67. The region is still fairly simple but has shown quite some growth this morning. Flaring is expected to remain below C level. A filament eruption is seen off the North Eastern hemisphere around 3:00UT. Coronagraph data are not yet available to assess the extent of the likely associated CME. Proton flux values are at background levels and expected to remain so.

Solar wind has recovered to background conditions with Solar wind speed dropping to 450 km/s by around 2:00 UT this morning and remained stable since. Total magnetic field has been fluctuating around 3-4nT with a variable Bz. A possible arrival of the December 15 CME is no longer expected. A transition into a negative sector is expected within the next 24 hours with then also the influence of the negative polarity equatorial coronal hole possibly setting in. However, the leading part of the coronal hole which passed the central meridian on December 18 is not likely to bring any strong effects. A more significant high speed stream influence is only expected 3-4 days from now from the trailing part of the coronal hole which only now starts passing the central meridian. Geomagnetic conditions were quiet to unsettled (both local K Dourbes and NOAA Kp 1-3). Quiet to unsettled conditions are expected over the next days.

Die heute international geschätzte Sonnenfleckenanzahl (ISN): 011, basierend auf 06 Stationen.

Solarindizes für den 19 Dec 2017

Wolf-Zahl Catania	011
10cm Solarflux	069
AK Chambon La Forêt	012
AK Wingst	006
Geschätzer Ap-Wert	005
Geschätzte internationale Sonnenfleckenzahl	007 - Basierend auf 19 Stationen

Zusammenfassung auffälliger Ereignisse

Zur Verfügung gestellt vom Solar Influences Data Analysis Center© - SIDC - Verarbeitet von SpaceWeatherLive

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