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Daily bulletin on solar and geomagnetic activity from the SIDC

Emesso: 2019 Dec 19 1233 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
19 Dec 2019	070	016
20 Dec 2019	070	017
21 Dec 2019	070	017

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.

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 showed the ongoing passage of a coronal hole high speed stream. Solar wind speed was between 500-550km/s. Total magnetic field has restored over the period to under 5nT with a variable Bz. The magnetic field phi angle was stable in the positive sector. Solar wind conditions are expected to remain enhanced over the next 48 hours but Solar wind speed is expected to start to decline within the next 24 hours.

Geomagnetic conditions have been unsettled to active (NOAA Kp 2-4 and local K Dourbes 1-4). Geomagnetic conditions are expected to be unsettled over the next 24-48 hours in the wake of the passing high speed stream, with initially an active period also still possible.

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

Solar indices for 18 Dec 2019

Wolf number Catania	///
10cm solar flux	070
AK Chambon La Forêt	023
AK Wingst	017
Estimated Ap	015
Estimated international sunspot number	000 - Based on 22 stations

Noticeable events summary

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

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