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Daily bulletin on solar and geomagnetic activity from the SIDC

Emesso: 2016 May 21 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
21 May 2016	102	022
22 May 2016	103	011
23 May 2016	105	015

Bulletin

Over the past 24 hours solar activity has been low. The largest flare was a B5.9 class flare, 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 been slowly increasing from around 400 to 500 km/s over the past 24 hours. The total magnetic field strength has slowly increased from 6 and 10 nT. The Bz component fluctuated between -10 and +10 nT, but has been largely negative this morning. Geomagnetic conditions ranged between Kp index 0-5 (NOAA) and local K index 1-4 (Dourbes) over the past 24 hours. The Kp reached 5 this morning as a result of the negative Bz and increasing solar wind speed. A large Northern positive polar coronal hole is currently positioned in the Western hemisphere of the Sun that may be the cause of enhanced solar wind speeds at the Earth.

Today's estimated international sunspot number (ISN): 018, based on 18 stations.

Solar indices for 20 May 2016

Wolf number Catania	///
10cm solar flux	100
AK Chambon La Forêt	012
AK Wingst	008
Estimated Ap	007
Estimated international sunspot number	044 - Based on 23 stations

Noticeable events summary

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

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