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Daily bulletin on solar and geomagnetic activity from the SIDC

Emesso: 2017 Feb 16 1231 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
16 Feb 2017	075	011
17 Feb 2017	075	025
18 Feb 2017	075	012

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 was around 310 km/s until 6:25 UT on February 16, when it jumped to around 370 km/s, probably marking the arrival of a high speed stream from a positive coronal hole. Since then, solar wind speed has fluctuated between 370 and 430 km/s. The magnitude of the Interplanetary Magnetic Field (IMF) was around 3 nT until about 1:45 UT on February 16, when it started rising to values around 10 nT. Quiet geomagnetic conditions (K Dourbes between 0 and 2; NOAA Kp between 1 and 2) were registered in the past 24 hours. Due to the arrival of the high speed stream, quiet to active geomagnetic levels (K Dourbes < 5) are expected on February 16, 17 and 18, with possible minor storm episodes (K Dourbes = 5).

Today's estimated international sunspot number (ISN): 014, based on 21 stations.

Solar indices for 15 Feb 2017

Wolf number Catania	///
10cm solar flux	075
AK Chambon La Forêt	006
AK Wingst	002
Estimated Ap	002
Estimated international sunspot number	023 - Based on 26 stations

Noticeable events summary

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

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