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Daily bulletin on solar and geomagnetic activity from the SIDC

Emesso: 2017 Oct 17 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
17 Oct 2017	073	006
18 Oct 2017	074	007
19 Oct 2017	074	018

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 530 to about 475 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 4 nT. Quiet to unsettled geomagnetic conditions (K Dourbes between 1 and 3; NOAA Kp between 1 and 3) were registered in the past 24 hours. Quiet to unsettled geomagnetic levels are expected on October 17 and 18, with a chance for active intervals (K Dourbes = 4). Active conditions are possible on October 19, with a chance for minor storm intervals (K Dourbes = 5), under the influence of another high speed stream associated with a negative equatorial coronal hole.

Today's estimated international sunspot number (ISN): 000, based on 15 stations.

Solar indices for 16 Oct 2017

Wolf number Catania	011
10cm solar flux	071
AK Chambon La Forêt	014
AK Wingst	011
Estimated Ap	010
Estimated international sunspot number	000 - Based on 25 stations

Noticeable events summary

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

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