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Daily bulletin on solar and geomagnetic activity from the SIDC

Emesso: 2017 Dec 27 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
27 Dec 2017	074	007
28 Dec 2017	072	007
29 Dec 2017	070	007

Bulletin

Solar activity was low, no C-class flares in past 24 h. There is only one region visible on disk (Catania group 67, NOAA active region 2692) with beta magnetic field configuration. C-class flaring is possible, although not very likely.

Proton flux levels are at background values and are expected to remain so. No Earth-directed CMEs were observed.

Solar wind speed is at 460 km/s with interplanetary magnetic field magnitude of 5 nT. Geomagnetic conditions ranged from quiet to active in past 24 h (both locally and at planetary levels). The high speed solar wind associated with the low latitude extension of the southern polar coronal hole (negative polarity) is likely passing south of the Earth. Quieto to unsettled conditions, with isolated active periods can be expected for the next 24 h.

Today's estimated international sunspot number (ISN): 013, based on 13 stations.

Solar indices for 26 Dec 2017

Wolf number Catania	///
10cm solar flux	072
AK Chambon La Forêt	025
AK Wingst	016
Estimated Ap	015
Estimated international sunspot number	016 - Based on 20 stations

Noticeable events summary

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

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