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Daily bulletin on solar and geomagnetic activity from the SIDC

Emesso: 2017 Dec 23 1321 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
23 Dec 2017	077	008
24 Dec 2017	077	014
25 Dec 2017	077	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.

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

Solar wind speed is at 380 km/s with interplanetary magnetic field magnitude of 7 nT. A sector boundary crossing was seen around 22:00 UT on 22 December, with polarity changing from positive to negative. The arrival of a high speed stream from a negative coronal hole is expected within 24 h. Geomagnetic conditions have been quiet, active periods and possibly minor storms are possible under the influence of the high speed stream.

Today's estimated international sunspot number (ISN): 027, based on 08 stations.

Solar indices for 22 Dec 2017

Wolf number Catania	027
10cm solar flux	075
AK Chambon La Forêt	007
AK Wingst	001
Estimated Ap	002
Estimated international sunspot number	024 - Based on 11 stations

Noticeable events summary

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

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