Viewing archive of Tuesday, 4 December 2018

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2018 Dec 04 1233 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
04 Dec 2018	067	008
05 Dec 2018	068	006
06 Dec 2018	068	007

Bulletin

The solar activity has been quiet over the past 24 hours. The visible solar disc remained spotless, and no significant flare has been recorded. Quiet flaring conditions are expected for the next 24-hour period.

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 reached 506 km/s on December 3, around 13.00 UT and then slowly decreased to the current value of 406 km/s; The interplanetary magnetic field strength fluctuated between 4 and 9 nT and the southward magnetic component between -7 and 7 nT. The solar wind parameters are expected decrease and return towards an ambient background and slow solar wind speed regime. Moreover, a CME was observed headed south on December 30 with low speed. The northern flank of this CME may glance Earth later today or earlier on December 5. Slightly enchantment of the solar wind parameters might be observed.

The geomagnetic conditions were quiet to unsettled with a short period of active condition observed by the local station in Dourbes (K-Dourbs=4) on December 3, at 17:00 UT. The conditions are expected to be mainly quiet (short unsettled period cannot be excluded) as the Earth is entering the slow solar wind speed regime..

Today's estimated international sunspot number (ISN): 000, based on 20 stations.

Solar indices for 03 Dec 2018

Wolf number Catania	000
10cm solar flux	068
AK Chambon La Forêt	018
AK Wingst	///
Estimated Ap	011
Estimated international sunspot number	000 - Based on 19 stations

Noticeable events summary

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

All times in UTC

<< Go to daily overview page