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Daily bulletin on solar and geomagnetic activity from the SIDC

Emesso: 2017 May 19 1232 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 2017	072	023
20 May 2017	072	024
21 May 2017	072	024

Bulletin

In the past 24 hours, no C flares were observed. Very low solar activity (no C flares) is expected in the next 24 hours. Solar wind speed measured by DSCOVR decreased from about 400 to 370 km/s until around 20h UT on May 18, when it increased again to current values of about 480 km/s. The magnitude of the Interplanetary Magnetic Field (IMF) varied between about 3 and 13 nT. Quiet to unsettled geomagnetic conditions (K Dourbes between 1 and 3; NOAA Kp between 1 and 3) were registered in the past 24 hours. Active (K Dourbes = 4) to minor storm conditions (K Dourbes = 5) are possible on May 19, 20 and 21, due to the expected high speed stream from a negative equatorial coronal hole.

Today's estimated international sunspot number (ISN): 023, based on 15 stations.

Solar indices for 18 May 2017

Wolf number Catania	025
10cm solar flux	072
AK Chambon La Forêt	015
AK Wingst	011
Estimated Ap	013
Estimated international sunspot number	021 - Based on 26 stations

Noticeable events summary

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

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