Viewing archive of Thursday, 27 December 2018

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2018 Dec 27 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
27 Dec 2018	069	002
28 Dec 2018	069	010
29 Dec 2018	069	018

Bulletin

Solar activity was at very low levels. The Sun was spotless for the 12th consecutive day (SILSO). 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 transited the central meridian.

Solar activity is expected to remain at very low levels.

Solar wind speed showed a generally declining trend, from about 355 km/s at the beginning of the period to 315 km/s at the end (DSCOVR). Bz ranged from -4 to +4 nT. The interplanetary magnetic field remained chiefly directed towards the Sun (negative sector). Quiet geomagnetic conditions were observed.

Quiet geomagnetic conditions are expected to continue, until the arrival of the wind stream associated with the extension of the northern polar CH, currently expected for late on 28 or on 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 16 stations.

Solar indices for 26 Dec 2018

Wolf number Catania	///
10cm solar flux	069
AK Chambon La Forêt	008
AK Wingst	002
Estimated Ap	002
Estimated international sunspot number	000 - Based on 22 stations

Noticeable events summary

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

All times in UTC

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