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Daily bulletin on solar and geomagnetic activity from the SIDC

Emesso: 2018 Dec 19 1231 UTC

SIDC Forecast

Brillamenti solari

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

Geomagnetism

Quiet (A<20 and K<4)

Protoni solari

Quiet

	10cm flux	Ap
19 Dec 2018	070	007
20 Dec 2018	070	008
21 Dec 2018	070	004

Bulletin

The Sun is spotless and did not produce any B flares or brighter in the past 24 hours. The chance for a C flare in the next 24 hours is estimated at only 2%.

No Earth-directed Coronal Mass Ejections (CMEs) were observed in available coronagraphic imagery.

The greater than 10 MeV proton flux was at nominal levels in the past 24 hours, and is expected to stay at nominal levels in the next 24 hours.

The solar wind speed near Earth as registered by DSCOVR gradually increased from about 400 to 520 km/s in the past 24 hours (current values around 490 km/s), under the influence of a solar wind stream associated with an isolated negative polarity coronal hole. The Interplanetary Magnetic Field (IMF) was predominantly directed towards the Sun and varied between about 1 and 9 nT. Bz was never below -6 nT. Solar wind speed is expected to stay elevated on December 19 and the first half of December 20.

Quiet to unsettled geomagnetic conditions (K Dourbes between 1 and 3; NOAA Kp between 1 and 3) were registered in the past 24 hours. There is a chance for active intervals (K Dourbes = 4) on December 19 and the first half of December 20. Quiet to unsettled geomagnetic levels (K Dourbes < 4) are expected in the second half of December 20 and on December 21.

Today's estimated international sunspot number (ISN): 000, based on 09 stations.

Solar indices for 18 Dec 2018

Wolf number Catania	000
10cm solar flux	070
AK Chambon La Forêt	010
AK Wingst	008
Estimated Ap	007
Estimated international sunspot number	000 - Based on 16 stations

Noticeable events summary

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

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