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Daily bulletin on solar and geomagnetic activity from the SIDC

Випущено: 2016 May 29 1230 UTC

SIDC Forecast

Сонячні спалахи

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

Geomagnetism

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

Сонячні протони

Quiet

	10cm flux	Ap
29 May 2016	087	013
30 May 2016	087	013
31 May 2016	087	005

Bulletin

Only B-class flares were observed during the last 24 hours. The strongest was a B7.2 flare peaking at 06:56UT (29 May) and produced by NOAA 2548. A long-duration B3.4 event (peaking at 03:21UT) had the spotless active region near the northeast limb as its source. The associated coronal mass ejection had no earth-directed component. Small region NOAA 2549 was stable and produced a B2 flare. No earth-directed coronal mass ejections (CMEs) were observed.

There remains a chance on an isolated C-class flare.

Earth remained under the weakening influence of a coronal hole (CH) high speed stream (HSS). Solar wind speed decreased from an initial range between 450 and 550 km/s to values between 400 and 450 km/s at the end of the observing period. Bz varied mostly between -6 and +6 nT. The interplanetary magnetic field was directed towards the Sun. Quiet to unsettled geomagnetic conditions were observed, with Dourbes recording an active episode during the 21UT-interval.

Quiet to active geomagnetic conditions are expected with the arrival of the HSS from the northern CH later today or tomorrow. There's a small chance on an isolated minor storming episode.

Today's estimated international sunspot number (ISN): 031, based on 11 stations.

Solar indices for 28 May 2016

Wolf number Catania	///
10cm solar flux	088
AK Chambon La Forêt	022
AK Wingst	016
Estimated Ap	018
Estimated international sunspot number	032 - Based on 25 stations

Noticeable events summary

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

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