Viewing archive of Thursday, 20 April 2017

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2017 Apr 20 1230 UTC

SIDC Forecast

Solar flares

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

Geomagnetism

Minor storm expected (A>=30 or K=5)

Solar protons

Quiet

	10cm flux	Ap
20 Apr 2017	081	034
21 Apr 2017	081	017
22 Apr 2017	081	017

Bulletin

NOAA AR 2651 has decayed into a beta region and produced no C-class flares in past 24 h, but they remain likely to occur in the coming hours.

No Earth directed Coronal Mass Ejections (CMEs) have been detected (although coronagraph data is unavailable at the moment of writing). Solar protons have remained at background levels over the past 24 hours.

The expected high speed stream has arrived to the Earth with solar wind speeds reaching 585 km/s (but still increasing) and generating active conditions locally (k=4) and moderate storms at planetary level (Kp=6) starting at midnight. The disturbed conditions are expected to continue in the coming 48 h.

Today's estimated international sunspot number (ISN): 029, based on 21 stations.

Solar indices for 19 Apr 2017

Wolf number Catania	///
10cm solar flux	081
AK Chambon La Forêt	024
AK Wingst	017
Estimated Ap	018
Estimated international sunspot number	016 - Based on 30 stations

Noticeable events summary

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

All times in UTC

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