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Daily bulletin on solar and geomagnetic activity from the SIDC

Emesso: 2016 May 18 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
18 May 2016	104	013
19 May 2016	106	016
20 May 2016	105	014

Bulletin

Over the past 24 hours solar activity has been low. The largest flare was a B4.1 class flare, produced by Active Region (AR) 2544 (Macintosh class:Cao; Mag. type:Beta-gamma). All other ARs have been quiet. AR 2544 has exhibited significant 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 medium probability of C-class flares and a low probability of M-class flares. The solar wind speed has remained around 550 km/s over the past 24 hours. The total magnetic field strength has fluctuated around 6 nT. The Bz component fluctuated between -6 and +6 nT. Geomagnetic conditions ranged between Kp index 2-3 (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 central longitudes of the Sun and will rotate into the Western hemisphere in the coming days, the resulting Co-rotating Interaction Region (CIR) and high-speed stream (HSS) may enhance geo- activity. The CME produced at 15:24 UT on 15-May-2016 has shown no influence on the Earth yet, but may in coming hours.

Today's estimated international sunspot number (ISN): 030, based on 18 stations.

Solar indices for 17 May 2016

Wolf number Catania	///
10cm solar flux	103
AK Chambon La Forêt	025
AK Wingst	016
Estimated Ap	017
Estimated international sunspot number	037 - Based on 26 stations

Noticeable events summary

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

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