Viewing archive of Tuesday, 11 December 2018

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2018 Dec 11 1230 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
11 Dec 2018	071	010
12 Dec 2018	070	012
13 Dec 2018	069	007

Bulletin

Solar activity has been quiet over the past 24 hours. There are no significant Active Regions on the solar disk. Flaring conditions are expected to remain quiet with a very small change of C-class flares.

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

The solar wind speed has been slowly decreasing from around 650 to 525 km/s over the past 24 hours. The total magnetic field strength has fluctuated around 5 nT. The Bz component was largely positive, fluctuating between -5 and +5 nT.

The elevated solar wind speeds were a consequence of a large Coronal Hole (which reached the central meridian on December 04). The enhanced solar wind conditions are beginning to abate but could still cause enhanced geomagnetic activity.

Geomagnetic conditions ranged between Kp index 1-3 (NOAA) and local K index 1-3 (Dourbes) over the past 24 hours.

Today's estimated international sunspot number (ISN): 012, based on 16 stations.

Solar indices for 10 Dec 2018

Wolf number Catania	000
10cm solar flux	071
AK Chambon La Forêt	013
AK Wingst	///
Estimated Ap	011
Estimated international sunspot number	000 - Based on 26 stations

Noticeable events summary

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

All times in UTC

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