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Daily bulletin on solar and geomagnetic activity from the SIDC

Emesso: 2016 May 26 1230 UTC

SIDC Forecast

Brillamenti solari

C-class flares expected, (probability >=50%)

Geomagnetism

Active conditions expected (A>=20 or K=4)

Protoni solari

Quiet

	10cm flux	Ap
26 May 2016	093	008
27 May 2016	090	018
28 May 2016	089	010

Bulletin

NOAA 2548 produced the strongest flare of the period, a B9.3 flare peaking at 21:17UT on 25 May. The region is slowly developing, with a few minor filaments near the main spot and some areas of mixed magnetic polarities. NOAA 2546 was quiet and is approaching the western solar limb. No earth-directed coronal mass ejections (CMEs) were observed.

There's a chance on an isolated C-class flare.

Solar wind speed continued its gradual decline from an initial 400 km/s to around 330 km/s by the end of the period. Bz varied between -4 and +4 nT, being mostly positive. The Interplanetary Magnetic Field was directed away from the Sun. Quiet geomagnetic conditions were observed.

Mostly quiet geomagnetic conditions are expected until the arrival of the co-rotating interaction region (CIR) associated with the wind stream from the small negative southern coronal hole (CH). A sector boundary crossing may precede or coincide with the CIR. The arrival of these structures is expected for 26 or 27 May, and may result in active geomagnetic conditions with a slight chance on a minor storming episode. Effects from the wind stream from the negative northern CH are expected for 28 May.

Today's estimated international sunspot number (ISN): 033, based on 28 stations.

Solar indices for 25 May 2016

Wolf number Catania	048
10cm solar flux	094
AK Chambon La Forêt	005
AK Wingst	003
Estimated Ap	003
Estimated international sunspot number	031 - Based on 19 stations

Noticeable events summary

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

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