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Daily bulletin on solar and geomagnetic activity from the SIDC

Vydáno: 2016 Jan 24 1230 UTC

SIDC Forecast

Sluneční erupce

C-class flares expected, (probability >=50%)

Geomagnetism

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

Sluneční protony

Quiet

	10cm flux	Ap
24 Jan 2016	100	008
25 Jan 2016	104	006
26 Jan 2016	108	022

Bulletin

A single C-class flare was observed during the period. This long duration C1 flare was produced by NOAA 2488 and peaked at 04:55UT. The faculae field preceding old active region NOAA 2481 has started to round the southeast limb. This region was the source of some flaring activity and coronal mass ejections (CMEs) during its transit over the Sun's backside. The filament near NOAA 2487 has stretched to about 40 degrees in length and is transiting the central meridian. No earth-directed CMEs were observed.

There remains a good chance on a C-class flare.

Earth exited the high speed stream of the southern polar coronal hole (CH) late on 23 January. Solar wind speed declined from initial values between 550-600 km/s to values between 410-470 km/s by the end of the period. Bz varied between -5 nT and +5 nT, while the interplanetary magnetic field was mostly directed towards the Sun. Quiet to unsettled geomagnetic conditions were observed.

Mostly quiet to unsettled geomagnetic conditions are expected. Starting late on 25 or on 26 January, chances on an active episode may increase following the expected arrival of the high speed stream from the (positive) northern polar CH extension.

Today's estimated international sunspot number (ISN): 044, based on 07 stations.

Solar indices for 23 Jan 2016

Wolf number Catania	///
10cm solar flux	099
AK Chambon La Forêt	020
AK Wingst	011
Estimated Ap	011
Estimated international sunspot number	057 - Based on 20 stations

Noticeable events summary

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

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