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Daily bulletin on solar and geomagnetic activity from the SIDC

Emesso: 2017 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 2017	080	019
20 Feb 2017	082	017
21 Feb 2017	082	015

Bulletin

In the past 24 hours, no C flares were observed. The X-ray background increased from about B1 to B3 level. Very low solar activity (no C flares) is expected in the next 24 hours, with a slight chance for a C flare. A filament eruption was observed west of NOAA AR 2636 in ground- based H alpha images and HeII AIA images around 5:20 UT on February 19. There were no signs of an associated CME in the available coronagraph images. 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 varied between about 480 and 620 km/s, with current values around 555 km/s. The magnitude of the Interplanetary Magnetic Field (IMF) varied between about 2 and 10 nT, with current values around 4 nT. There was a short interval between 21h and 22h UT on February 18 when Bz was below -5 nT, but this did not lead to higher than unsettled levels (K Dourbes = 3). Quiet to active geomagnetic conditions (K Dourbes between 1 and 4; NOAA Kp between 1 and 4) were registered in the past 24 hours. Due to the continued influence of the high speed stream, quiet to active geomagnetic levels (K Dourbes < 5) are expected on February 19, 20 and 21, with a slight chance for minor storm episodes (K Dourbes = 5) on February 19.

Today's estimated international sunspot number (ISN): 021, based on 16 stations.

Solar indices for 18 Feb 2017

Wolf number Catania	///
10cm solar flux	077
AK Chambon La Forêt	021
AK Wingst	020
Estimated Ap	020
Estimated international sunspot number	012 - Based on 21 stations

Noticeable events summary

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

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