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Daily bulletin on solar and geomagnetic activity from the SIDC

Emesso: 2016 Jan 18 1231 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
18 Jan 2016	098	002
19 Jan 2016	096	013
20 Jan 2016	094	003

Bulletin

Solar x-ray flux flatlined near the B2-level, with no flares observed during the last 24 hours. The currently visible sunspot groups are small with little signs of growth. A small filament eruption took place near the Central Meridian (CM) on 17 January, starting around 20:30UT. Some coronal dimming was observed, but currently available coronagraphic imagery from SOHO and STEREO-A do not show an associated earth-directed coronal mass ejection (CME).

Mostly quiet flaring conditions are expected, with only a small chance on an isolated C-class flare. Solar wind speed showed an overall declining trend and varied between 350 and 300 km/s. Bz varied slowly between -5 and +4 nT, and the Interplanetary Magnetic Field was directed mostly away from the Sun. Quiet geomagnetic conditions were observed. A southern polar coronal hole (CH) extension is transiting the CM.

Quiet geomagnetic conditions are expected, with active episodes possible as a result of the faint and slow 14 January CME which is expected to arrive on 19 January.

Today's estimated international sunspot number (ISN): 045, based on 12 stations.

Solar indices for 17 Jan 2016

Wolf number Catania	///
10cm solar flux	101
AK Chambon La Forêt	007
AK Wingst	003
Estimated Ap	002
Estimated international sunspot number	058 - Based on 26 stations

Noticeable events summary

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

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