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Daily bulletin on solar and geomagnetic activity from the SIDC

Emesso: 2017 Oct 16 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
16 Oct 2017	071	013
17 Oct 2017	073	008
18 Oct 2017	073	007

Bulletin

The Sun did not produce any flares in the past 24 hours. The chance for a C flare in the next 24 hours is estimated at 5%. No Earth- directed Coronal Mass Ejections (CMEs) were observed in available coronagraphic imagery. The greater than 10 MeV proton flux was at nominal levels.

Solar wind speed measured by DSCOVR decreased from about 575 to about 530 km/s in the past 24 hours. The Interplanetary Magnetic Field (IMF) was directed away from the Sun and its magnitude ranged between about 1 and 6 nT. Quiet to active geomagnetic conditions (K Dourbes between 1 and 4; NOAA Kp between 1 and 5) were registered in the past 24 hours. Active levels (K Dourbes = 4) are possible on October 16, 17 and 18 due to continued influence of the high speed stream associated with a positive coronal hole, with a slight chance for minor storm conditions (K Dourbes = 5).

Today's estimated international sunspot number (ISN): 000, based on 19 stations.

Solar indices for 15 Oct 2017

Wolf number Catania	///
10cm solar flux	070
AK Chambon La Forêt	024
AK Wingst	022
Estimated Ap	025
Estimated international sunspot number	000 - Based on 24 stations

Noticeable events summary

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

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