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Daily bulletin on solar and geomagnetic activity from the SIDC

Emesso: 2017 Dec 29 1230 UTC

SIDC Forecast

Brillamenti solari

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

Geomagnetism

Quiet (A<20 and K<4)

Protoni solari

Quiet

	10cm flux	Ap
29 Dec 2017	071	007
30 Dec 2017	072	007
31 Dec 2017	074	010

Bulletin

Solar activity was low, no C-class flares in past 24 h. There are no active regions visible on the solar disk. A CME was observed in LASCO-C2 starting at 23:12 UT on 28 December, directed towards the south east and associated with a B8.3 flare (peak 22:29 UT), behind the east limb. This CME is backsided and will not affect the Earth. No C-class flares expected (although this region behind the limb may change the situation).

Proton flux levels are at background values and are expected to remain so. No Earth-directed CMEs were observed.

Solar wind speed is at 400 km/s with interplanetary magnetic field magnitude of 5 nT. Geomagnetic conditions have been quiet, and expected to remain so. There is a small positive coronal hole located at 30 degrees northern latitude which may affect the Earth in 48h, but its effect should be minimal.

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

Solar indices for 28 Dec 2017

Wolf number Catania	///
10cm solar flux	071
AK Chambon La Forêt	010
AK Wingst	006
Estimated Ap	005
Estimated international sunspot number	000 - Based on 29 stations

Noticeable events summary

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

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