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Daily bulletin on solar and geomagnetic activity from the SIDC

Emesso: 2015 Dec 23 1230 UTC

SIDC Forecast

Valid from 1230 UTC, 23 Dec 2015 until 25 Dec 2015
Brillamenti solari

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

Geomagnetism

Quiet (A<20 and K<4)

Protoni solari

Quiet

10cm fluxAp
23 Dec 2015135007
24 Dec 2015135006
25 Dec 2015135006

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 Catania082
10cm solar flux130
AK Chambon La Forêt017
AK Wingst013
Estimated Ap012
Estimated international sunspot number069 - Based on 16 stations

Noticeable events summary

DayBeginMaxFineLocStrengthOP10cmCatania/NOAARadio burst types
23002300400052S22E63M4.71F05/2473II/2IV/2

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

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