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Daily bulletin on solar and geomagnetic activity from the SIDC

Emesso: 2017 Jan 23 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
23 Jan 2017	086	002
24 Jan 2017	084	002
25 Jan 2017	084	001

Bulletin

Solar activity was very low during the period, with no C-class flares or higher reported. The currently visible sunspot regions are decaying. NOAA 2628 has a stable leading spot but a decaying middle portion. 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 an isolated C-class event.

Solar wind speed declined from about 510 to 440 km/s, with Bz mostly fluctuating between -2 nT and +3 nT. The interplanetary magnetic field was directed away from the Sun. A small positive equatorial coronal hole (CH) started its transit of the central meridian.

The geomagnetic field was at unsettled to quiet levels and is expected to remain so. Starting 27 or 28 January, the arrival of the CH's particle stream may affect the earth environment.

Today's estimated international sunspot number (ISN): 060, based on 10 stations.

Solar indices for 22 Jan 2017

Wolf number Catania	///
10cm solar flux	087
AK Chambon La Forêt	011
AK Wingst	010
Estimated Ap	010
Estimated international sunspot number	070 - Based on 23 stations

Noticeable events summary

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

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