Viewing archive of Thursday, 6 December 2018

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2018 Dec 06 1233 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
06 Dec 2018	070	003
07 Dec 2018	070	020
08 Dec 2018	070	019

Bulletin

The solar activity has been quiet over the past 24 hours. One small bipolar sunspot group (Catania sunspot group 2, NOAA 2729) is visible on the disc, but no significant flare has been recorded. Flaring conditions is expected to remain quiet with a small change of C-class flare.

No Earth directed Coronal Mass Ejection has been observed. The greater than 10 MeV solar protons flux remained at nominal levels over the past 24 hours and is expected to remain so.

The solar wind measurements remained under the influence of the enhanced solar wind associated with the Coronal Hole (which reached the central meridian on November 27). The wind speed decreased from 462 to about 390 km/s. The interplanetary magnetic field strength was below 5.5 nT and the southward magnetic component fluctuated between -4 and 4.5 nT. The solar wind parameters are expected to continue to decrease to the slow solar wind regime. Then the solar wind parameters are expected to be enhanced due to the fast solar wind associated with this coronal hole (which reached the central meridian on December 04) on December 7.

The geomagnetic conditions were quiet. The conditions are expected to be mainly quiet as the Earth is entering the slow solar wind speed regime. The geomagnetic conditions will then become more active due to the arrival of the fast solar wind on December 7.

Today's estimated international sunspot number (ISN): 020, based on 07 stations.

Solar indices for 05 Dec 2018

Wolf number Catania	017
10cm solar flux	///
AK Chambon La Forêt	///
AK Wingst	///
Estimated Ap	///
Estimated international sunspot number	017 - Based on 15 stations

Noticeable events summary

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

All times in UTC

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