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Daily bulletin on solar and geomagnetic activity from the SIDC

Vydáno: 2017 Dec 22 1230 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
22 Dec 2017	077	005
23 Dec 2017	077	023
24 Dec 2017	077	031

Bulletin

Solar activity was low with the only region on disk (Catania group 67, NOAA active region 2692) producing several B flares. The strongest a B7.2 flare peaking at 1:50UT. As the region develops with flux emerging in the leading part, chances for possible C flaring are increasing but are still low. A long filament located near the centre of the disk seems to have erupted just before midnight. A possibly associated weak CME is visible in SoHO/LASCO C2 coronagraph images from 2:48 UT onwards. It is directed towards the South West and has an angular extent of less than 90 degrees. This is not expected to influence Earth. Proton flux levels are at background values and are expected to remain so.

Solar wind was nominal with solar wind speed decreasing further from near 400 km/s to around 320 km/s and total magnetic field in the 2-5nT range. Solar wind conditions are likely to increase over the next 24-48 hours with an expected sector boundary crossing and an increase in solar wind speed. While solar wind speed increase may initially be limited, the trailing part of the previously elongated coronal hole, that now seems to have become detached, is expected to increase Solar wind conditions more seriously from around noon December 23 onwards. Geomagnetic conditions were quiet (both local K Dourbes and NOAA Kp 0-1). They are expected to remain at quiet to unsettled levels but increasing towards noon December 23 when active periods and possibly minor storms become possible under the influence of the anticipated high speed stream.

Today's estimated international sunspot number (ISN): 025, based on 06 stations.

Solar indices for 21 Dec 2017

Wolf number Catania	///
10cm solar flux	076
AK Chambon La Forêt	004
AK Wingst	002
Estimated Ap	002
Estimated international sunspot number	021 - Based on 10 stations

Noticeable events summary

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

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