Viewing archive of Wednesday, 18 December 2019

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2019 Dec 18 1230 UTC

SIDC Forecast

Solar flares

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

Geomagnetism

Active conditions expected (A>=20 or K=4)

Solar protons

Quiet

	10cm flux	Ap
18 Dec 2019	071	020
19 Dec 2019	071	021
20 Dec 2019	071	017

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.

A small negative polarity equatorial coronal hole passed the central meridian overnight. It remains to be seen if it will have any influence on Solar wind conditions later in the week.

Solar high energy proton fluxes were at background levels and are expected to remain so.

Solar wind conditions showed the expected arrival of the high speed stream. Solar wind speed increased since midnight from just over 300 km/s to well over 500 km/s since. Total magnetic field reached a peak of 12nT with a Southward component of -10nT. Solar wind speed is expected to further increase, reaching over 600km/s and then level off by the end of the next 24 hour period before starting a slow and gentle decline.

Geomagnetic conditions were quiet to unsettled (both NOAA Kp and local K Dourbes reached 3 just only in the 9-12UT period). Geomagnetic conditions are expected to be unsettled to active over the next day and will continue to be at least unsettled for the next days.

Today's estimated international sunspot number (ISN): 000, based on 14 stations.

Solar indices for 17 Dec 2019

Wolf number Catania	///
10cm solar flux	071
AK Chambon La Forêt	005
AK Wingst	002
Estimated Ap	001
Estimated international sunspot number	000 - Based on 17 stations

Noticeable events summary

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

All times in UTC

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