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Daily bulletin on solar and geomagnetic activity from the SIDC

Vydáno: 2017 Jan 29 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
29 Jan 2017	079	003
30 Jan 2017	077	005
31 Jan 2017	076	019

Bulletin

Solar activity was low, with an isolated C2.8 flare produced by spotless region NOAA 2627 near the west limb on 28 January at 21:09UT. A new active region rotated over the east limb with only a few tiny spots. NOAA 2628 and NOAA 2629 were quiet. No earth-directed coronal mass ejections (CMEs) were observed in available coronagraphic imagery. The greater than 10MeV proton flux was at nominal levels.

Mostly quiet flaring conditions are expected, with a small chance on a C-class event.

Solar wind speed declined from 540 km/s to values around 460 km/s under the waning influence of the coronal hole's high speed stream (HSS). Bz fluctuated between -4 and +4 nT. The interplanetary magnetic field was mostly directed away from the Sun. A negative CH is transiting the central meridian (CM) and may start influencing the earth environment around 31 January, probably preceded by a sector boundary crossing (SBC).

The geomagnetic field was at quiet (Dourbes) to unsettled (Kp) levels. Mostly quiet to unsettled conditions are expected till the arrival of the SBC and the CIR/HSS structure from the negative CH, when active episodes may become possible.

Today's estimated international sunspot number (ISN): 033, based on 09 stations.

Solar indices for 28 Jan 2017

Wolf number Catania	///
10cm solar flux	079
AK Chambon La Forêt	016
AK Wingst	010
Estimated Ap	010
Estimated international sunspot number	029 - Based on 27 stations

Noticeable events summary

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

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