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Daily bulletin on solar and geomagnetic activity from the SIDC

Emesso: 2016 May 19 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
19 May 2016	102	011
20 May 2016	100	008
21 May 2016	098	007

Bulletin

Over the past 24 hours solar activity has been low. The largest flare was a B5.1 class flare, produced by Active Region (AR) 2544 (Macintosh class:Cso; Mag. type:Beta). All other ARs have been quiet. AR 2544 has exhibited some flux emergence and cancellation in HMI observations, which may lead to further flares. Solar protons have remained at background levels over the past 24 hours. 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 around 5 nT. The Bz component fluctuated between -5 and +5 nT, but has been mainly 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 and may enhance solar wind speeds at the Earth. The CME produced at 15:24 UT on 15-May-2016 has shown no influence at the Earth.

Today's estimated international sunspot number (ISN): 047, based on 20 stations.

Solar indices for 18 May 2016

Wolf number Catania	046
10cm solar flux	102
AK Chambon La Forêt	010
AK Wingst	010
Estimated Ap	010
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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