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Daily bulletin on solar and geomagnetic activity from the SIDC

Emesso: 2016 May 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 May 2016	094	003
25 May 2016	093	007
26 May 2016	092	011

Bulletin

Eight B-class flares and one C-class event were observed during the period, with the C1.3 flare peaking at 10:20UT on 24 May. The source of all this minor flaring activity was NOAA 2546 which remains the largest sunspot group currently visible. A new small sunspot region emerged near disk centre (Catania 80; N12E01), but remained quiet. No earth-directed coronal mass ejections (CMEs) were observed.

Mostly quiet conditions are expected, with a small chance on an isolated C-class flare.

Solar wind speed mostly varied between 400 and 500 km/s. Bz varied between -6 and +6 nT, with the Interplanetary Magnetic Field directed away from the Sun. A small negative coronal hole (CH) on the southern hemisphere has transited the central meridian. Quiet geomagnetic conditions were observed.

Quiet to unsettled geomagnetic conditions are expected during the first 24 hours. Late on 25 or on 26 May, the wind stream associated with the small negative southern CH may affect the geomagnetic environment. This may result in active geomagnetic conditions.

Today's estimated international sunspot number (ISN): 024, based on 20 stations.

Solar indices for 23 May 2016

Wolf number Catania	021
10cm solar flux	097
AK Chambon La Forêt	008
AK Wingst	004
Estimated Ap	004
Estimated international sunspot number	016 - Based on 23 stations

Noticeable events summary

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

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