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Daily bulletin on solar and geomagnetic activity from the SIDC

Emesso: 2017 Dec 24 1230 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
24 Dec 2017	076	023
25 Dec 2017	076	031
26 Dec 2017	075	013

Bulletin

Solar activity was very low with X-ray flux remaining below B level, apart from a single B1 flare from the only region on disk (Catania group 67, NOAA active region 2692). There is a relatively small chance for C -flaring over the next days. Around 18:00 UT a filament eruption was visible in the North Eastern quadrant. Coronagraph images do not reveal any associated CME signatures. No Earth directed CMEs were recorded in coronagraph images. Proton flux levels are at background values and expected to remain so.

Solar wind showed the expected arrival of the high speed stream from the equatorial negative polarity coronal hole. Solar wind speed first increased to 400 km/s but then declined again in the afternoon of December 23. Since midnight it is increasing again to close to 500 km/s currently. Total magnetic field in the compression region measured mostly in the 9-12nT range with a peak of over 14.5nT around 7:20UT. The magnetic field Bz component was variable with excursions down to -9nT. Solar wind speed is expected to further increase and remain elevated over the next few days under influence of the coronal hole high speed stream. Geomagnetic conditions were quiet to unsettled (local K Dourbes 0-2 and NOAA Kp 0-3). Geomagnetic conditions are expected to be unsettled to active with minor geomagnetic storms possible under the influence of the high speed stream.

Today's estimated international sunspot number (ISN): 026, based on 07 stations.

Solar indices for 23 Dec 2017

Wolf number Catania	///
10cm solar flux	076
AK Chambon La Forêt	008
AK Wingst	005
Estimated Ap	004
Estimated international sunspot number	027 - Based on 12 stations

Noticeable events summary

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

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