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Daily bulletin on solar and geomagnetic activity from the SIDC

Emesso: 2019 Dec 21 1230 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
21 Dec 2019	071	006
22 Dec 2019	071	007
23 Dec 2019	071	007

Bulletin

Solar X ray flux remained below B level throughout the period. There are no spotted regions on disk and X-ray flux is expected to remain at background levels.

A filament erupted from the far Southern hemisphere this morning (between 6-9UT) but coronagraph data do not (yet) show any associated CME signatures. No Earth-directed CME's were detected in coronagraph images.

A low latitude negative polarity coronal hole started transiting the central meridian at midnight and may cause enhancements of Solar wind conditions starting December 24.

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 and is still expected to rise before starting a gradual recovery.

Solar wind showed a further decaying trend in the wake of the high speed stream. Solar wind speed decreased slowly from around 450 km/s to under 400 km/s. Total magnetic field was in a nominal 4-5nT regime. The magnetic field phi angle was in the positive sector. Solar wind conditions are expected to become and remain nominal in the coming days.

Geomagnetic conditions were quiet (local K Dourbes 1-2 and NOAA Kp 0-2) and this is expected to persist.

Today's estimated international sunspot number (ISN): 000, based on 12 stations.

Solar indices for 20 Dec 2019

Wolf number Catania	000
10cm solar flux	070
AK Chambon La Forêt	009
AK Wingst	008
Estimated Ap	006
Estimated international sunspot number	000 - Based on 14 stations

Noticeable events summary

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

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