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Daily bulletin on solar and geomagnetic activity from the SIDC

Emesso: 2015 Dec 23 1230 UTC

SIDC Forecast

Brillamenti solari

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

Geomagnetism

Quiet (A<20 and K<4)

Protoni solari

Quiet

	10cm flux	Ap
23 Dec 2015	135	007
24 Dec 2015	135	006
25 Dec 2015	135	006

Bulletin

There are currently five sunspot groups visible, as identified by Catania. The most interesting group is Catania group 5 (NOAA 2473), which produced an M4.7 flare (peaking at 0:40 UT today) and two C-class flares during the past 24 hours. The M4.7 flare was associated with a dimming, a type II radio burst and an eastward CME. The CME had an apparent width of 70 degrees and an estimated projected speed of 530 km/s (as reported by CACTus). First analysis indicates that no influence on the Earth environment should be expected. Flaring at the M-level is expected to continue, in particular from the Catania group 5, with a slight chance for an X-class flare. The solar wind speed is varying between 400 and 500 km/s. The interplanetary magnetic field (IMF) magnitude is below 10 nT, with a fluctuating Bz component. Quiet to unsettled conditions (K < 4) were noted by Dourbes and NOAA. These geomagnetic conditions are expected to continue.

Today's estimated international sunspot number (ISN): 063, based on 14 stations.

Solar indices for 22 Dec 2015

Wolf number Catania	082
10cm solar flux	130
AK Chambon La Forêt	017
AK Wingst	013
Estimated Ap	012
Estimated international sunspot number	069 - Based on 16 stations

Noticeable events summary

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

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