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Tägliches Bulletin zur solaren und geomagnetischen Aktivität des SIDC

Ausgestellt: 2018 Aug 25 1230 UTC

Vorhersage des SIDC

Sonneneruptionen

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

Geomagnetismus

Active conditions expected (A>=20 or K=4)

Sonnenprotonen

Quiet

	10cm Fluss	Ap
25 Aug 2018	072	021
26 Aug 2018	072	021
27 Aug 2018	071	008

Bulletin

NOAA active region 2720 has been growing steadily and was the source of a series of B flares over the period. The strongest was a B4.1 flare peaking at 10:48UT. The other region on disk (NOAA 2719) seemed to be in decay at the end of the period. Overall probability for the occurrence of a C-flare remains low (around 20%).

No Earth directed CMEs have been identified in coronagraph data.

Proton flux levels were at background values and are expected to remain so.

Solar wind speed continued to decrease (to as low as 320 km/s) until around midnight when a steady increase to current values of 400 km/s set in. Throughout the period, the magnetic field was only slightly elevated (mostly 5-8 nT), but with the magnetic field rotation indicating that this is indeed the passing of a magnetic cloud as expected from the august 20 CME. More recently, magnetic field strength reached up to 10 nT. Apart from at the start of the period, Bz has been mostly positive throughout the period. Solar wind conditions are expected to remain elevated over the next 24 hours but with a decreasing trend.

Geomagnetic conditions were mostly quiet (local K Dourbes and NOAA Kp 0-2) apart from an isolated period of unsettled (K=3) conditions both locally and in terms of Kp at the start of the period, related to the negative Bz at that time. Geomagnetic conditions may still see active periods over the next 24 hours should the enhanced magnetic field show persistent periods of Southward orientation. Later, geomagnetic conditions should remain quiet to unsettled.

Die heute international geschätzte Sonnenfleckenanzahl (ISN): 034, basierend auf 18 Stationen.

Solarindizes für den 24 Aug 2018

Wolf-Zahl Catania	///
10cm Solarflux	072
AK Chambon La Forêt	008
AK Wingst	006
Geschätzer Ap-Wert	005
Geschätzte internationale Sonnenfleckenzahl	029 - Basierend auf 28 Stationen

Zusammenfassung auffälliger Ereignisse

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

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