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Daily bulletin on solar and geomagnetic activity from the SIDC

Emesso: 2019 Dec 22 1231 UTC

SIDC Forecast

Brillamenti solari

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

Geomagnetism

Quiet (A<20 and K<4)

Protoni solari

Quiet

	10cm flux	Ap
22 Dec 2019	070	005
23 Dec 2019	070	007
24 Dec 2019	070	017

Bulletin

Solar X ray flux remained below B level throughout the period. Apart from some very short lived spots, the visible disk was spotless and X-ray flux is expected to remain at background levels.

No Earth-directed CME's were detected in coronagraph images.

Solar high energy proton fluxes were at background levels and are expected to remain so. The >2MeV electron flux is enhanced (though not over the event threshold) as a consequence of the high speed stream passage but expected to slowly start a gradual return to background values.

Solar wind further returned to nominal, with Solar wind speed decreasing from around 390 km/s to under 340 km/s and total magnetic field in the 4-6nT regime. The magnetic field phi angle was in the positive sector. Solar wind conditions are expected to remain nominal in the coming days with later on December 24 a possible weak enhancement associated to the low latitude negative polarity coronal hole in the Southern hemisphere.

Geomagnetic conditions were quiet (both local K Dourbes and NOAA Kp 0-2) and this is expected to persist. From later December 24 we expect a slight increase to quiet to unsettled conditions.

Today's estimated international sunspot number (ISN): 000, based on 08 stations.

Solar indices for 21 Dec 2019

Wolf number Catania	///
10cm solar flux	071
AK Chambon La Forêt	007
AK Wingst	005
Estimated Ap	004
Estimated international sunspot number	000 - Based on 18 stations

Noticeable events summary

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

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