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Daily bulletin on solar and geomagnetic activity from the SIDC

Emesso: 2017 Feb 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 Feb 2017	074	017
18 Feb 2017	074	021
19 Feb 2017	074	022

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. The solar wind near Earth is under the influence of a high speed stream by a positive coronal hole. In the past 24 hours, solar wind speed measured by DSCOVR rose from about 375 km/s to about 500 km/s, as the solar wind from the broader part of the coronal hole arrived at Earth. The magnitude of the Interplanetary Magnetic Field (IMF) varied between about 2 and 13 nT, with current values around 6 nT. There were a few short intervals with negative Bz, down to -9 nT. Quiet to active geomagnetic conditions (K Dourbes between 2 and 4; NOAA Kp between 2 and 4) were registered in the past 24 hours. Due to the influence of the high speed stream, quiet to active geomagnetic levels (K Dourbes < 5) are expected on February 17, 18 and 19, with possible minor storm episodes (K Dourbes = 5).

Today's estimated international sunspot number (ISN): 012, based on 15 stations.

Solar indices for 16 Feb 2017

Wolf number Catania	025
10cm solar flux	074
AK Chambon La Forêt	019
AK Wingst	008
Estimated Ap	008
Estimated international sunspot number	012 - Based on 35 stations

Noticeable events summary

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

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