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Daily bulletin on solar and geomagnetic activity from the SIDC

Emesso: 2015 Dec 19 1230 UTC

SIDC Forecast

Brillamenti solari

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

Geomagnetism

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

Protoni solari

Quiet

	10cm flux	Ap
19 Dec 2015	117	018
20 Dec 2015	117	013
21 Dec 2015	117	007

Bulletin

The Sun produced two C flares in the past 24 hours. The brightest flare was a C3.1 flare released by NOAA AR 2468, peaking at 2:04 UT on December 19. C flares are possible within the next 24 hours, with a chance (15%) for an M flare. During the past 24 hours, the solar wind speed gradually decreased from about 400 to 350 km/s with intermittent peaks up to 440 km/s. The magnitude of the Interplanetary Magnetic Field varied between 1 and 6 nT. During the past 24 hours, quiet to unsettled geomagnetic levels were registered (K Dourbes between 1 and 3, NOAA Kp between 1 and 3). Due to the expected arrival of the December 16 CMEs, active to minor storm conditions (K Dourbes = 4-5) are expected on December 19, with a chance for moderate to major storm conditions (K Dourbes = 6-7). Quiet to unsettled geomagnetic levels are expected on December 20 and 21, with a chance for active (K Dourbes = 4) excursions.

Today's estimated international sunspot number (ISN): 049, based on 11 stations.

Solar indices for 18 Dec 2015

Wolf number Catania	///
10cm solar flux	117
AK Chambon La Forêt	009
AK Wingst	007
Estimated Ap	005
Estimated international sunspot number	050 - Based on 14 stations

Noticeable events summary

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

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