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Daily bulletin on solar and geomagnetic activity from the SIDC

Emesso: 2017 May 15 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
15 May 2017	071	018
16 May 2017	071	029
17 May 2017	071	024

Bulletin

There are currently no sunspots groups on the visible hemisphere of the Sun. 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 has increased from about 310 to 400 km/s in the past 24 hours, while the magnitude of the Interplanetary Magnetic Field (IMF) varied between about 3 and 14 nT. This is probably due to the arrival of a high speed stream from a positive equatorial coronal hole. The Bz component is fluctuating heavily and reached a lowest value of about -10 nT for a very short time. Solar wind speed is expected to increase further within the next 24 hours. Late on May 16, a glancing blow from the partial halo CME of May 13 may enhance solar wind conditions further. Quiet to active geomagnetic conditions (K Dourbes between 0 and 4; NOAA Kp between 1 and 4) were registered in the past 24 hours. Due to the arrival of the high speed stream, quiet to active levels (K Dourbes < 5) are possible on May 15, 16 and 17, with a chance for minor geomagnetic storm intervals (K Dourbes = 5).

Today's estimated international sunspot number (ISN): 000, based on 24 stations.

Solar indices for 14 May 2017

Wolf number Catania	///
10cm solar flux	///
AK Chambon La Forêt	018
AK Wingst	012
Estimated Ap	012
Estimated international sunspot number	000 - Based on 30 stations

Noticeable events summary

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

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