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Tägliches Bulletin zur solaren und geomagnetischen Aktivität des SIDC

Ausgestellt: 2017 Sep 22 1236 UTC

Vorhersage des SIDC

Sonneneruptionen

C-class flares expected, (probability >=50%)

Geomagnetismus

Quiet (A<20 and K<4)

Sonnenprotonen

Quiet

	10cm Fluss	Ap
22 Sep 2017	067	004
23 Sep 2017	076	016
24 Sep 2017	079	028

Bulletin

Over the past 24 hours the solar activity was very low: no flare has been recorded. Catania sunspot groups 55 and 56 (NOAA active regions 2680 and 2681) are stable and are unlikely to produce any strong flaring activity. Catania sunspot group 55 (NOAA active region 2680) will soon turn over the east solar limb. The top of the loops from the returning region Catania sunspot group 46 (NOAA active region 2673), which was very active in the previous rotation, will start to be seen at the west limb tomorrow, on Sept 23. We expect the solar activity to remain low until the return of Catania sunspot group 46 (NOAA active region 2673). Then we expect the activity to increase with C to M-class flare.

No Earth directed CMEs have been observed and the solar protons remained at background level over the past 24 hours.

The Earth remains inside a slow (about 400 Km/s) solar wind flow. The interplanetary magnetic field magnitude remained below 6 nT and the Bz component fluctuated between -4 and 4 nT. The associated fast solar wind to the small equatorial coronal hole that has crossed the central meridian on Sept 20 is expected to arrive at Earth on Sept 23 late afternoon.

Geomagnetic conditions were quiet to unsettled with Kp (NOAA) and local K (Dourbes) indexes ranging between 0-3 and 0-2 respectively. The geomagnetic conditions are expected to remain quiet until Sept 23 when the fast solar will reach Earth.

Die heute international geschätzte Sonnenfleckenanzahl (ISN): 020, basierend auf 17 Stationen.

Solarindizes für den 21 Sep 2017

Wolf-Zahl Catania	023
10cm Solarflux	073
AK Chambon La Forêt	013
AK Wingst	006
Geschätzer Ap-Wert	006
Geschätzte internationale Sonnenfleckenzahl	022 - Basierend auf 32 Stationen

Zusammenfassung auffälliger Ereignisse

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

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