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Daily bulletin on solar and geomagnetic activity from the SIDC

Випущено: 2017 Dec 25 1230 UTC

SIDC Forecast

Сонячні спалахи

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

Geomagnetism

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

Сонячні протони

Quiet

	10cm flux	Ap
25 Dec 2017	076	007
26 Dec 2017	075	013
27 Dec 2017	074	010

Bulletin

Solar activity was low, no C-class flares in past 24 h. There is only one region visible on disk (Catania group 67, NOAA active region 2692) with beta magnetic field configuration. C-class flaring is possible although not very likely.

Proton flux levels are at background values and are expected to remain so. No Earth-directed seems occurred.

Solar wind speed is at 480 km/s with interplanetary magnetic field magnitude of 6 nT. The influence of the high speed stream from a coronal hole is fading. It produced only unsettled levels at planetary levels (Kp up to 3) and isolated active conditions locally at Dourbes (KDourbes up to 4). The coronal hole has irregular shape and is divided in two parts, the southern part (extension of the southern polar coronal hole) may still influence the Earth within 48 h. Quiet to active conditions can be expected.

Today's estimated international sunspot number (ISN): 024, based on 07 stations.

Solar indices for 24 Dec 2017

Wolf number Catania	///
10cm solar flux	076
AK Chambon La Forêt	024
AK Wingst	015
Estimated Ap	014
Estimated international sunspot number	026 - Based on 13 stations

Noticeable events summary

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

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