Viewing archive of Saturday, 31 December 2016

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2016 Dec 31 1230 UTC

SIDC Forecast

Solar flares

Quiet conditions (<50% probability of C-class flares)

Geomagnetism

Minor storm expected (A>=30 or K=5)

Solar protons

Quiet

	10cm flux	Ap
31 Dec 2016	074	025
01 Jan 2017	074	027
02 Jan 2017	074	008

Bulletin

No C flares were observed in the past 24 hours. No C flares are expected in the next 24 hours. From 9h UT on December 31 onwards, solar wind speed gradually increased from about 300 km/s to about 370 km/s around 11:20 UT, when a shock in the solar wind was observed by DSCOVR. Current solar wind speed is around 470 km/s. The magnitude of the Interplanetary Magnetic Field (IMF) rose from around 3 nT to current values of about 14 nT. This is probably the effect of the arrival of the Coronal Interaction Region in front of the expected high speed stream associated with a positive coronal hole. Quiet geomagnetic conditions (K Dourbes between 0 and 2; NOAA Kp between 1 and 2) were registered in the past 24 hours. Active to minor storm geomagnetic levels (K Dourbes = 4-5) are expected on December 31. On January 1 and 2, active levels are expected (K Dourbes = 4), with a chance for minor storm intervals (K Dourbes = 5)

Today's estimated international sunspot number (ISN): 008, based on 10 stations.

Solar indices for 30 Dec 2016

Wolf number Catania	///
10cm solar flux	074
AK Chambon La Forêt	008
AK Wingst	003
Estimated Ap	002
Estimated international sunspot number	012 - Based on 19 stations

Noticeable events summary

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

All times in UTC

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