Viewing archive of Monday, 31 December 2018

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2018 Dec 31 1249 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
31 Dec 2018	069	008
01 Jan 2019	069	008
02 Jan 2019	069	007

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) started its transit of the central meridian yesterday. Solar activity is expected to remain at very low levels. Solar wind speed gradually decreased from about 560 till 460 km/s (DSCOVR). Bz varied between -5.8 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.

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

Solar indices for 30 Dec 2018

Wolf number Catania	///
10cm solar flux	069
AK Chambon La Forêt	018
AK Wingst	///
Estimated Ap	012
Estimated international sunspot number	000 - Based on 18 stations

Noticeable events summary

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

All times in UTC

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