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Tägliches Bulletin zur solaren und geomagnetischen Aktivität des SIDC

Ausgestellt: 2017 Jul 26 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
26 Jul 2017	070	014
27 Jul 2017	070	014
28 Jul 2017	070	008

Bulletin

Solar activity was at very low levels during the period. Sunspot region NOAA 2668 is decaying and barely visible. No earth-directed coronal mass ejections (CMEs) were observed in available coronagraphic imagery. The greater than 10 MeV proton flux reached a maximum of about 2 pfu (i.e. below the 10 pfu event threshold) around 21-22UT, and is now gradually declining.

Quiet flaring conditions are expected.

The earth environment remained under the influence of the high speed stream (HSS) from a positive polarity coronal hole (CH). Wind speeds gradually increased from an initial value near 570 km/s to about 660 km/s by 03UT, then decreased to 590 km/s by the end of the period (DSCOVR). Bz oscillated between -5 and +7 nT. The interplanetary magnetic field was mostly directed away from the Sun, with a "towards" sector during the 14-22UT interval.

The geomagnetic field was at quiet to unsettled levels, with an active episode during the 06-09UT interval recorded by both Dourbes and in Kp. Mostly quiet to unsettled geomagnetic conditions are expected, with a chance on another active episode under the persistent influence of the CH HSS.

Die heute international geschätzte Sonnenfleckenanzahl (ISN): 000, basierend auf 14 Stationen.

Solarindizes für den 25 Jul 2017

Wolf-Zahl Catania	000
10cm Solarflux	070
AK Chambon La Forêt	019
AK Wingst	013
Geschätzer Ap-Wert	013
Geschätzte internationale Sonnenfleckenzahl	000 - Basierend auf 32 Stationen

Zusammenfassung auffälliger Ereignisse

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

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