Viewing archive of Thursday, 7 December 2017

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2017 Dec 07 1230 UTC

SIDC Forecast

Solar flares

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

Geomagnetism

Quiet (A<20 and K<4)

Solar protons

Quiet

	10cm flux	Ap
07 Dec 2017	070	008
08 Dec 2017	072	007
09 Dec 2017	072	007

Bulletin

The solar activity remained quiet over the past 24 hours. No C-class flare and above have been recorded. The bipolar sunspot (Catania sunspot group 65, NOAA Active Region 2690) has produced one small B-class flare. Quiet flaring conditions are expected for the next 24-hour period.

No Earth directed Coronal Mass Ejection has been observed. The greater than 10 MeV solar protons flux remained at nominal levels over the past 24 hours and is expected to remain so.

The Earth remained under the influence of the solar wind stream associated with the Coronal Hole (which has crossed the central meridian on Dec 01). The wind speed has gradually decreased from 550 km/s to 500 km/s. The interplanetary magnetic field magnitude remained below 6 nT, and the Bz component fluctuated between -5 and 5 nT. The solar wind conditions are expected to continue to decline and return to nominal conditions.

Geomagnetic conditions were quiet to unsettle (local K Dourbes 1-3, NOAA Kp 2-3) due to the solar wind stream associated with the Coronal Hole. The conditions are expected to return to the nominal level as the solar wind is declining.

Today's estimated international sunspot number (ISN): 010, based on 10 stations.

Solar indices for 06 Dec 2017

Wolf number Catania	013
10cm solar flux	068
AK Chambon La Forêt	019
AK Wingst	016
Estimated Ap	017
Estimated international sunspot number	013 - Based on 13 stations

Noticeable events summary

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

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