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Daily bulletin on solar and geomagnetic activity from the SIDC

Emesso: 2016 May 20 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
20 May 2016	101	013
21 May 2016	100	011
22 May 2016	099	010

Bulletin

Over the past 24 hours solar activity has been low. The largest flares were two B3.9 class flares, produced by Active Region (AR) 2546 (Mcintosh class:Cho; Mag. type:Beta). All other ARs have been quiet. Solar protons have remained at background levels over the past 24 hours. There have been no Earth directed CMEs detected. Solar activity is expected to remain low over the next 24 hours with a small probability of C-class flares. The solar wind speed has remained around 450 km/s over the past 24 hours. The total magnetic field strength has fluctuated between 5 and 9 nT. The Bz component fluctuated between -5 and +6 nT, but has been largely positive. Geomagnetic conditions ranged between Kp index 1-3 (NOAA) and local K index 1-3 (Dourbes) over the past 24 hours. A large Northern positive polar coronal hole is currently positioned in the Western hemisphere of the Sun that may enhance solar wind speeds at the Earth.

Today's estimated international sunspot number (ISN): 047, based on 13 stations.

Solar indices for 19 May 2016

Wolf number Catania	///
10cm solar flux	099
AK Chambon La Forêt	016
AK Wingst	008
Estimated Ap	008
Estimated international sunspot number	045 - Based on 22 stations

Noticeable events summary

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

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