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Daily bulletin on solar and geomagnetic activity from the SIDC

Emesso: 2016 Dec 30 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
30 Dec 2016	073	006
31 Dec 2016	073	014
01 Jan 2017	073	015

Bulletin

No C flares were observed in the past 24 hours. No C flares are expected in the next 24 hours. Solar wind speed further decreased from about 380 to 340 km/s in the past 24 hours as measured by DSCOVR. The magnitude of the Interplanetary Magnetic Field (IMF) varied between about 3 and 6 nT. A rise in solar wind speed is anticipated on December 31, due to the expected arrival of a high speed stream associated with a positive coronal hole. Quiet geomagnetic conditions (K Dourbes between 0 and 2; NOAA Kp between 0 and 2) were registered in the past 24 hours. Quiet to unsettled levels (K Dourbes < 4) are expected on December 30. On December 31 and January 1, active intervals (K Dourbes = 4) are possible due to the expected arrival of a high speed stream associated with a positive coronal hole.

Today's estimated international sunspot number (ISN): 011, based on 15 stations.

Solar indices for 29 Dec 2016

Wolf number Catania	///
10cm solar flux	073
AK Chambon La Forêt	007
AK Wingst	004
Estimated Ap	004
Estimated international sunspot number	010 - Based on 22 stations

Noticeable events summary

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

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