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Daily bulletin on solar and geomagnetic activity from the SIDC

Emesso: 2017 Apr 19 1230 UTC

SIDC Forecast

Brillamenti solari

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

Geomagnetism

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

Protoni solari

Quiet

	10cm flux	Ap
19 Apr 2017	080	022
20 Apr 2017	083	007
21 Apr 2017	087	007

Bulletin

The active region that rotated over the east limb (NOAA AR 2651) has a beta-gamma magnetic field configuration and produced a C5.5 flare with peak at 20:10 UT on April 18. More C-class flares, and possibly M-class flares, can be expected.

A partial halo CME was associated with the C5.5 flare, first seen at 19:48 UT by LASCO-C2, directed towards the east with speeds around 900 km/s. Due to the location of the source region, only a shock could be expected to arrive at the Earth on April 21. Solar protons have remained at background levels over the past 24 hours.

The solar wind at the Earth is showing signs of compression preceding the expected high speed stream, with KDourbes reaching only 3 but Kp going to 5. Active to minor storm conditions expected.

Today's estimated international sunspot number (ISN): 015, based on 22 stations.

Solar indices for 18 Apr 2017

Wolf number Catania	///
10cm solar flux	080
AK Chambon La Forêt	018
AK Wingst	008
Estimated Ap	006
Estimated international sunspot number	023 - Based on 30 stations

Noticeable events summary

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

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