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Daily bulletin on solar and geomagnetic activity from the SIDC

Emesso: 2018 Dec 30 1230 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
30 Dec 2018	069	009
31 Dec 2018	069	006
01 Jan 2019	069	003

Bulletin

Solar activity remained 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. A negative polarity equatorial coronal hole (CH) is starting its transit of the central meridian.

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 490 and 550 km/s, with a brief maximum of 565 km/s around 16UT (DSCOVR). Bz varied between -5 and +5 nT. The interplanetary magnetic field was directed away from the Sun (positive sector). Geomagnetic activity ranged from quiet to unsettled conditions.

Quiet to unsettled geomagnetic conditions are expected, an isolated active interval remains possible.

Today's estimated international sunspot number (ISN): 000, based on 10 stations.

Solar indices for 29 Dec 2018

Wolf number Catania	///
10cm solar flux	069
AK Chambon La Forêt	015
AK Wingst	012
Estimated Ap	011
Estimated international sunspot number	000 - Based on 18 stations

Noticeable events summary

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

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