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Tägliches Bulletin zur solaren und geomagnetischen Aktivität des SIDC

Ausgestellt: 2017 May 20 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
20 May 2017	072	021
21 May 2017	072	024
22 May 2017	072	021

Bulletin

In the past 24 hours, no C flares were observed. Very low solar activity (no C flares) is expected in the next 24 hours. Solar wind speed measured by DSCOVR varied between about 430 and 490 km/s until around 18:30 UT on May 19, when it started rising to a plateau around 600 km/s. At 8:52 UT on May 20, the solar wind speed jumped to about 710 km/s. The magnitude of the Interplanetary Magnetic Field (IMF) varied between about 5 and 15 nT until 8:52 UT on May 20, when it fell from 13 to 6 nT. These are clear signs of the arrival of the predicted high speed stream from a negative equatorial coronal hole. Bz was regularly between -5 and -10 nT between 5h and 9h UT. Unsettled geomagnetic conditions (K Dourbes equal to 3; NOAA Kp between 2 and 4) were registered in the past 24 hours. Active (K Dourbes = 4) to minor storm conditions (K Dourbes = 5) are possible on May 20, 21 and 22, due to the arrival the predicted high speed stream.

Die heute international geschätzte Sonnenfleckenanzahl (ISN): 032, basierend auf 20 Stationen.

Solarindizes für den 19 May 2017

Wolf-Zahl Catania	028
10cm Solarflux	072
AK Chambon La Forêt	024
AK Wingst	016
Geschätzer Ap-Wert	016
Geschätzte internationale Sonnenfleckenzahl	023 - Basierend auf 23 Stationen

Zusammenfassung auffälliger Ereignisse

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

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