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Daily bulletin on solar and geomagnetic activity from the SIDC

Emesso: 2018 Feb 19 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
19 Feb 2018	069	019
20 Feb 2018	069	024
21 Feb 2018	069	012

Bulletin

There are no sunspot regions on the visible hemisphere of the Sun and flaring level is very low. The chance for a C flare in the next 24 hours is estimated at 5%. No Earth-directed Coronal Mass Ejections (CMEs) were observed in available coronagraphic imagery. The greater than 10 MeV proton flux was at nominal levels. Solar wind speed measured by DSCOVR was between about 520 and 670 km/s in the past 24 hours, with current values around 570 km/s. The Interplanetary Magnetic Field (IMF) was directed towards the Sun and its magnitude varied between about 2 and 8 nT. Bz was never below -5.5 nT. This enhanced solar wind is indicative of a negative coronal hole high speed stream. Quiet to active geomagnetic conditions (K Dourbes between 2 and 4; NOAA Kp between 2 and 5) were registered in the past 24 hours. Quiet to active levels (K Dourbes < 5) are possible on February 19, 20 and 21 due to the influence of the high speed stream associated with a negative coronal hole, with a chance for minor storm conditions (K Dourbes = 5).

Today's estimated international sunspot number (ISN): 000, based on 08 stations.

Solar indices for 18 Feb 2018

Wolf number Catania	///
10cm solar flux	070
AK Chambon La Forêt	026
AK Wingst	015
Estimated Ap	015
Estimated international sunspot number	000 - Based on 27 stations

Noticeable events summary

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

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