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Daily bulletin on solar and geomagnetic activity from the SIDC

Emesso: 2017 Apr 18 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
18 Apr 2017	075	010
19 Apr 2017	078	014
20 Apr 2017	081	007

Bulletin

The recurrent regions rotating over the east limb produced a C3.3 flare, peaking at 09:41 UT. Dimmings indicate that a CME may have been associated with this flare, but no coronagraph data is available yet to confirm. More C-class flares are expected, and M-class flares are possible.

No Earth directed Coronal Mass Ejections (CMEs) have been detected. Solar protons have remained at background levels over the past 24 hours.

Geomagnetic conditions have been at k = 1-2 levels. Solar wind speed is now at 325 km/s with interplanetary magnetic fields of 5 nT. A high speed solar wind from an equatorial coronal hole is expected within 24 h. Active to minor storm conditions expected.

Today's estimated international sunspot number (ISN): 023, based on 21 stations.

Solar indices for 17 Apr 2017

Wolf number Catania	///
10cm solar flux	075
AK Chambon La Forêt	008
AK Wingst	004
Estimated Ap	003
Estimated international sunspot number	000 - Based on 30 stations

Noticeable events summary

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

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