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Daily bulletin on solar and geomagnetic activity from the SIDC

Emesso: 2017 Nov 08 1244 UTC

SIDC Forecast

Brillamenti solari

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

Geomagnetism

Moderate (ISES: Major) magstorm expected (A>=50 or K=6)

Protoni solari

Quiet

	10cm flux	Ap
08 Nov 2017	068	039
09 Nov 2017	068	043
10 Nov 2017	068	024

Bulletin

The solar activity remains very quiet as the solar disc is spotless; no flares and no active regions have been recorded in past 24 h on the disc. The X-ray flux is expected to remain below C level.

No Earth directed Coronal Mass Ejections (CMEs) have been observed and the solar protons flux remained at background levels over the past 24 hours.

The high speed solar wind stream associated with the northern extension Coronal Hole (which has crossed the central meridian on Nov 04) has arrived and the Earth is in the fast solar wind with a speed around 600 and 660 Km/s since yesterday Nov 07, 17:45 UT. The interplanetary magnetic field magnitude reached 20 nT at 16:45 UT on Nov 07 with the arrival of the co- rotating interaction region, then slowly decreased to 7-8 nT. The Bz component was many southward and reached -13 nT at 16:45 UT on Nov 07. Currently, the Bz remains manly southward around -7 nT. The solar wind conditions are expected to persist until Nov 10 while under the influence of the high speed stream associated with the coronal hole.

Disturbed geomagnetic conditions were observed due to the fast solar wind and the Bz component of the interplanetary magnetic field being manly southward. Geomagnetic storms were observed: NOAA reported Kp=6 from 18:00 UT Nov 07 to 6:00 UT Nov 08 and local station at Dourbes reported K=5 from 17:00 UT Nov 07 to 2:00 UT on Nov 08. Further minor to moderate geomagnetic storms cannot be excluded, especially if Bz component remains negative for long period of time.

Today's estimated international sunspot number (ISN): 000, based on 06 stations.

Solar indices for 07 Nov 2017

Wolf number Catania	000
10cm solar flux	068
AK Chambon La Forêt	065
AK Wingst	034
Estimated Ap	038
Estimated international sunspot number	000 - Based on 28 stations

Noticeable events summary

Provided by the Solar Influences Data analysis Center© - SIDC - Processed by SpaceWeatherLive

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