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Daily bulletin on solar and geomagnetic activity from the SIDC

Emesso: 2019 Dec 17 1231 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
17 Dec 2019	070	006
18 Dec 2019	070	029
19 Dec 2019	070	021

Bulletin

Solar X ray flux remained below B level throughout the period. There are no active regions on disk 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.

Solar wind conditions were near nominal with Solar wind speed mostly around 350 km/s and total magnetic field under 5nT. The magnetic field phi angle is still in the negative sector. Later today the magnetic field phi angle is expected to switch into the positive sector, then followed by early tomorrow an increase of the Solar wind speed as the recurrent high speed stream from the equatorial coronal hole (positive polarity) sets in. Speeds are expected to reach around 600 km/s.

Geomagnetic conditions were quiet (NOA Kp 0-1 and local K Dourbes 0-2). Geomagnetic conditions are expected to rise by early tomorrow, associated to the high speed stream, reaching unsettled to active conditions tomorrow, with a slight possibility of an isolated minor geomagnetic storm episode.

Today's estimated international sunspot number (ISN): 000, based on 13 stations.

Solar indices for 16 Dec 2019

Wolf number Catania	000
10cm solar flux	070
AK Chambon La Forêt	004
AK Wingst	002
Estimated Ap	002
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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