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Daily bulletin on solar and geomagnetic activity from the SIDC

Vydáno: 2016 Dec 23 1252 UTC

SIDC Forecast

Sluneční erupce

Quiet conditions (<50% probability of C-class flares)

Geomagnetism

Active conditions expected (A>=20 or K=4)

Sluneční protony

Quiet

	10cm flux	Ap
23 Dec 2016	075	024
24 Dec 2016	076	016
25 Dec 2016	075	007

Bulletin

Solar activity was very quiet in the past 24 hours. No flares were observed. The only numbered NOAA active region (AR) 2620 is rotating across the west solar limb. A slow moving CME observed at the east limb starting at 21:34 UT (21-Dec-2016) as detected by CACTUS is not expected to be geoeffective. Solar protons have remained at background levels over the past 24 hours. There are no significant Active Regions (AR) on the Sun, therefore solar activity is expected to remain low over the next 24 hours with a small chance of B-class flares. The solar wind speed has decreased from 720 km/s to 620 km/s over the past 24 hours. The total magnetic field strength has fluctuated between 4 nT and 7 nT. The Bz component has fluctuated between -5 nT and +5 nT. Geomagnetic conditions ranged between Kp index 3-4 (NOAA) and local K index 2-4 (Dourbes) over the past 24 hours, with the enhanced values occurring due to fluctuating Bz and high speed solar wind generated from a large positive polarity coronal hole (CH). Enhanced solar wind conditions are expected to persist over the next couple of days due to the CH High Speed Stream (HSS). As a consequence Geomagnetic conditions are expected to be unsettled to active for the next couple of days, with a possibility of minor storms.

Today's estimated international sunspot number (ISN): 000, based on 14 stations.

Solar indices for 22 Dec 2016

Wolf number Catania	///
10cm solar flux	075
AK Chambon La Forêt	033
AK Wingst	026
Estimated Ap	027
Estimated international sunspot number	016 - Based on 13 stations

Noticeable events summary

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

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