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Daily bulletin on solar and geomagnetic activity from the SIDC

Emesso: 2015 Dec 22 1304 UTC

SIDC Forecast

Brillamenti solari

M-class flares expected (probability >=50%)

Geomagnetism

Quiet (A<20 and K<4)

Protoni solari

Quiet

	10cm flux	Ap
22 Dec 2015	127	015
23 Dec 2015	130	009
24 Dec 2015	133	004

Bulletin

Five sunspot groups were reported by Catania today. The most of the flaring activity in the past 24 hours was produced by the newly emerged Catania sunspot group 5 (NOAA AR 2473) at the south-east limb, the strongest flare being the M1.6 flare peaking at 03:34 UT today. Only weak and narrow CMEs were detected in association with the flaring activity. Catania sunspot group 4 (NOAA AR 2472), which produced two M-class flares yesterday, became more quiet. We expect the flaring activity at the M-level, in particular from the Catania sunspot group 5 (NOAA AR 2473), with a small chance for an X-class event. The Earth is currently inside a post-ICME solar wind flow, with the speed around 440 km/s and the interplanetary magnetic field (IMF) magnitude around 8 nT. The IMF north-south component Bz is fluctuating around zero, so quiet to unsettled conditions (K < 4) were reported by Dourbes and IZMIRAN, and only one interval of active geomagnetic conditions (Kp = 4) was reported by NOAA. Unsettled to active geomagnetic conditions are probable in the coming hours.

Today's estimated international sunspot number (ISN): 067, based on 08 stations.

Solar indices for 21 Dec 2015

Wolf number Catania	///
10cm solar flux	122
AK Chambon La Forêt	021
AK Wingst	040
Estimated Ap	043
Estimated international sunspot number	020 - Based on 13 stations

Noticeable events summary

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

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