Viewing archive of Saturday, 28 January 2017

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2017 Jan 28 1230 UTC

SIDC Forecast

Solar flares

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

Geomagnetism

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

Solar protons

Quiet

	10cm flux	Ap
28 Jan 2017	080	010
29 Jan 2017	079	007
30 Jan 2017	078	012

Bulletin

Solar activity was very low, NOAA 2629 producing the sole B-class flare of the period. A potentially active region is near the northeast limb. 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.

Earth remained under the influence of the coronal hole's high speed stream. Solar wind speed varied between 580 and 530 km/s, with Bz fluctuating between -4 and +4 nT. The interplanetary magnetic field was mostly directed away from the Sun. A negative coronal hole is at the central meridian (CM) and may start influencing the earth environment around 31 January, probably preceded by a sector boundary crossing (SBC) around 30 January.

The geomagnetic field was at quiet to active levels and is expected to evolve to quiet to unsettled levels, an active episode not excluded.

Today's estimated international sunspot number (ISN): 028, based on 17 stations.

Solar indices for 27 Jan 2017

Wolf number Catania	033
10cm solar flux	080
AK Chambon La Forêt	020
AK Wingst	021
Estimated Ap	022
Estimated international sunspot number	027 - Based on 22 stations

Noticeable events summary

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

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