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Daily bulletin on solar and geomagnetic activity from the SIDC

Emesso: 2018 Dec 26 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
26 Dec 2018	070	002
27 Dec 2018	070	003
28 Dec 2018	070	010

Bulletin

Solar activity was at very low levels. The Sun was spotless. No coronal mass ejections (CMEs) were observed over the last 24 hours. The greater than 10 MeV proton flux was at nominal values. A narrow extension of the positive polarity northern polar coronal hole (CH) has nearly finished its transit of the central meridian.

Solar activity is expected to remain at very low levels.

Solar wind speed varied between 340 and 370 km/s (DSCOVR). Bz ranged from -5 to +4 nT. The interplanetary magnetic field remained primarily directed towards the Sun (negative sector). Quiet geomagnetic conditions were observed.

Quiet geomagnetic conditions are expected to continue. The wind stream associated with the extension of the northern polar CH is expected to arrive on 28 or 29 December. This may result in active geomagnetic conditions, a minor storming interval is not excluded.

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

Solar indices for 25 Dec 2018

Wolf number Catania	///
10cm solar flux	070
AK Chambon La Forêt	006
AK Wingst	004
Estimated Ap	003
Estimated international sunspot number	000 - Based on 24 stations

Noticeable events summary

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

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