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Daily bulletin on solar and geomagnetic activity from the SIDC

Emesso: 2017 Nov 09 1230 UTC

SIDC Forecast

Brillamenti solari

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

Geomagnetism

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

Protoni solari

Quiet

	10cm flux	Ap
09 Nov 2017	068	022
10 Nov 2017	068	019
11 Nov 2017	068	006

Bulletin

The solar activity is quiet as the solar disc remains 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 have been observed and the solar protons flux remained at background levels over the past 24 hours.

The Earth remained in the fast solar wind with a speed of about 600-650 km/s. On Nov 09 early morning the solar wind started to decrease slowly to reached the speed of 550 km/s. The interplanetary magnetic field magnitude has also slowly decreased from 7 nT to below 5 nT. The Bz component was fluctuating between -7 and 7 nT being mainly negative and is currently around -5 nT. The solar wind speed is expected to continue to decrease until it reaches its nominal level by tomorrow.

Due to the fast solar wind and the Bz component of the interplanetary magnetic field being manly southward, unsettle to disturb geomagnetic conditions were observed with local K Dourbes 2-5 and NOAA Kp 3-5. The geomagnetic conditions are expected to remain disturb as long as the Earth remains in the solar wind flow associated with the high speed stream coming from the coronal hole (that has crossed the central meridian on Nov 4). Minor 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 16 stations.

Solar indices for 08 Nov 2017

Wolf number Catania	000
10cm solar flux	068
AK Chambon La Forêt	053
AK Wingst	041
Estimated Ap	049
Estimated international sunspot number	000 - Based on 11 stations

Noticeable events summary

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

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