Viewing archive of Saturday, 29 December 2018

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2018 Dec 29 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
29 Dec 2018	069	014
30 Dec 2018	069	010
31 Dec 2018	069	004

Bulletin

Solar activity was at very low levels. The Sun was spotless. No earth-directed coronal mass ejections (CMEs) were observed over the last 24 hours. The greater than 10 MeV proton flux was at nominal values.

Solar activity is expected to remain at very low levels.

Earth remained under the influence of the High Speed Stream (HSS) associated with the positive polarity coronal hole (CH). Solar wind speed varied mostly between 550 and 610 km/s, showing a slight decline towards 500 km/s by the end of the period (DSCOVR). Bz varied between -7 and +8 nT before midnight, and between -4 and +2 nT afterwards. The interplanetary magnetic field was directed away from the Sun (positive sector). Geomagnetic activity ranged from quiet to active conditions.

Quiet to unsettled geomagnetic conditions are expected, with a waning chance on another active episode during the next 24 hours.

Today's estimated international sunspot number (ISN): 000, based on 11 stations.

Solar indices for 28 Dec 2018

Wolf number Catania	000
10cm solar flux	069
AK Chambon La Forêt	026
AK Wingst	027
Estimated Ap	028
Estimated international sunspot number	000 - Based on 20 stations

Noticeable events summary

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

All times in UTC

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