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Daily bulletin on solar and geomagnetic activity from the SIDC

Emesso: 2017 Jan 21 1321 UTC

SIDC Forecast

Brillamenti solari

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

Geomagnetism

Quiet (A<20 and K<4)

Protoni solari

Quiet

	10cm flux	Ap
21 Jan 2017	084	010
22 Jan 2017	083	007
23 Jan 2017	081	007

Bulletin

The increase of the solar activity in the last 24 hours was mainly due to flaring from the Catania sunspot group 81 (NOAA AR 2628) which produced 9 B-class and 5 C-class flares. The Catania sunspot group 80 (NOAA AR 2627) also produced several B-class flares. The strongest reported flare was compact and confined C9.3 flare originating from the Catania sunspot group 81 (NOAA AR 2628), which peaked at 07:14 UT on January 21. In the coming hours we can expect B-class and C-class flares, in particular from the Catania sunspot group 81 (NOAA AR 2628). No Earth directed CMEs were observed during last 24 hours.

The solar wind speed amounts 480 km/s, and the interplanetary magnetic field magnitude is about 5nT. Presently, the geomagnetic conditions are quiet to unsettled and we expect them to remain so in the coming hours.

Today's estimated international sunspot number (ISN): 074, based on 23 stations.

Solar indices for 20 Jan 2017

Wolf number Catania	073
10cm solar flux	083
AK Chambon La Forêt	019
AK Wingst	013
Estimated Ap	012
Estimated international sunspot number	055 - Based on 28 stations

Noticeable events summary

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

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