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Daily bulletin on solar and geomagnetic activity from the SIDC

Emesso: 2016 Sep 20 1238 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
20 Sep 2016	083	026
21 Sep 2016	083	016
22 Sep 2016	083	007

Bulletin

Solar activity was very low. No C flares were observed in the past 24 hours. Solar activity is expected to remain very low (no C flaring) for the next 24 hours. Solar wind speed measured by DSCOVR rose gradually from about 390 to about 720 km/s after the arrival of a coronal hole high speed stream around 0h UT on September 20. Meanwhile the magnitude of the Interplanetary Magnetic Field increased from about 10 nT to a maximum of about 21 nT around 20:30 UT on September 19, and decreased again to current values around 5 nT. Bz was predominantly positive, but was mainly below -5 nT between 23h and 1h UT. Quiet to unsettled geomagnetic conditions (K Dourbes < 4) prevailed on September 19. K Dourbes values reached up to 4 and Kp values up to 5 during the first half of September 20. There is a chance for minor storm levels (K Dourbes = 5) on September 20 under the influence of the coronal hole high speed stream. Quiet to unsettled levels are expected on September 21 and 22, with a chance for active levels (K Dourbes = 4) on September 21 as the influence of the high speed stream wanes.

Today's estimated international sunspot number (ISN): 056, based on 19 stations.

Solar indices for 19 Sep 2016

Wolf number Catania	076
10cm solar flux	083
AK Chambon La Forêt	024
AK Wingst	010
Estimated Ap	009
Estimated international sunspot number	063 - Based on 27 stations

Noticeable events summary

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

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