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Daily bulletin on solar and geomagnetic activity from the SIDC

Emesso: 2016 Dec 19 1231 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
19 Dec 2016	073	009
20 Dec 2016	074	010
21 Dec 2016	075	006

Bulletin

Solar activity was very quiet in the past 24 hours without C-class flares reported. There is only one NOAA active region (AR) 2619 observed on visible side of the solar disk with simple magnetic configuration. No Earth directed CMEs were observed in the past 24 hours. The northern polar coronal hole, which expanded to low latitudes, may disturb the geospace environment from today (19-Dec-2016). Solar proton flux intensity is expected to lie within the background levels. Solar activity is expected to be low with some probability for C-class flares. Variations of the solar wind parameters were low. Total Interplanetary Magnetic field (IMF) strength varied between 7 and 4 nT, while Bz varied between -4.4 and 5.5 nT. The solar wind speed decreased from 450 km/s till 380 km/s. Geomagnetic conditions were quiet (K Dourbes between 0 and 2; NOAA Kp between 1 and 2). The geomagnetic conditions are presently quiet to unsettled. We expect active conditions later today and tomorrow due to expected arrival of the fast solar wind associated with the low latitude extend of the northern polar coronal hole.

Today's estimated international sunspot number (ISN): 026, based on 09 stations.

Solar indices for 18 Dec 2016

Wolf number Catania	///
10cm solar flux	072
AK Chambon La Forêt	013
AK Wingst	009
Estimated Ap	008
Estimated international sunspot number	033 - Based on 13 stations

Noticeable events summary

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

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