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Daily bulletin on solar and geomagnetic activity from the SIDC

Emesso: 2017 May 17 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
17 May 2017	074	017
18 May 2017	074	024
19 May 2017	074	010

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 550 to 470 km/s in the past 24 hours. The magnitude of the Interplanetary Magnetic Field (IMF) varied between about 2 and 6 nT. Solar wind speed is expected to decrease further within the next 24 hours. On May 17 or early on May 18, a glancing blow from the partial halo CME of May 13 may enhance solar wind conditions again. Quiet to unsettled geomagnetic conditions (K Dourbes between 1 and 3; NOAA Kp between 1 and 3) were registered in the past 24 hours. Quiet to unsettled levels are expected on May 17, 18 and the first half of May 19, with a chance for active geomagnetic levels (K Dourbes = 4) and a slight chance for minor geomagnetic storm intervals (K Dourbes = 5) on May 17 and 18. Active to minor storm conditions are possible late on May 19, as the high speed stream of a negative equatorial coronal hole is expected to arrive at Earth.

Today's estimated international sunspot number (ISN): 012, based on 22 stations.

Solar indices for 16 May 2017

Wolf number Catania	027
10cm solar flux	072
AK Chambon La Forêt	013
AK Wingst	010
Estimated Ap	010
Estimated international sunspot number	024 - Based on 26 stations

Noticeable events summary

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

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