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Daily bulletin on solar and geomagnetic activity from the SIDC

Emesso: 2016 Sep 21 1231 UTC

SIDC Forecast

Brillamenti solari

C-class flares expected, (probability >=50%)

Geomagnetism

Quiet (A<20 and K<4)

Protoni solari

Quiet

	10cm flux	Ap
21 Sep 2016	087	011
22 Sep 2016	087	007
23 Sep 2016	087	007

Bulletin

Solar activity was low. The Sun produced 2 low C flares in the past 24 hours. The brightest flare was a C1.7 flare released by NOAA AR 2595 with peak time 11:51 UT on September 21. Low solar activity (C flaring) is expected in the next 24 hours. Solar wind speed measured by DSCOVR decreased gradually from about 720 to about 550 km/s in the wake of a coronal hole high speed stream. Meanwhile the magnitude of the Interplanetary Magnetic Field varied beween about 1 and 6 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. Quiet to unsettled levels are expected on September 21, 22 and 23, with a chance for active levels (K Dourbes = 4) on September 21 as the influence of the coronal hole high speed stream wanes.

Today's estimated international sunspot number (ISN): 056, based on 13 stations.

Solar indices for 20 Sep 2016

Wolf number Catania	081
10cm solar flux	085
AK Chambon La Forêt	026
AK Wingst	021
Estimated Ap	023
Estimated international sunspot number	054 - Based on 31 stations

Noticeable events summary

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

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