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Daily bulletin on solar and geomagnetic activity from the SIDC

Emesso: 2016 Apr 30 1230 UTC

SIDC Forecast

Brillamenti solari

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

Geomagnetism

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

Protoni solari

Quiet

	10cm flux	Ap
30 Apr 2016	092	011
01 May 2016	095	019
02 May 2016	098	007

Bulletin

Solar activity has been low, only one C-class flare in past 24 h: a C1.2 flare that peaked at 10:47 UT from NOAA AR 2539 (Catania 66 and 67). 6 active regions are visible on the disk, 4 of them with beta magnetic field configuration, C-class flaring is likely.

Geomagnetic conditions have been quiet. Solar wind speed is currently at 350 km/s with interplanetary magnetic field magnitude of 7 nT. A sector boundary crossing from positive to negative polarity was observed at ACE around 03:00 UT, marking the upcoming arrival of an expected fast speed stream from a coronal hole. Currently two coronal holes are in Earth- affecting position, one in the northern hemisphere and one at the equator, both have negative polarity. Up to minor storm conditions are expected for today and tomorrow.

Today's estimated international sunspot number (ISN): 094, based on 19 stations.

Solar indices for 29 Apr 2016

Wolf number Catania	105
10cm solar flux	092
AK Chambon La Forêt	005
AK Wingst	004
Estimated Ap	003
Estimated international sunspot number	082 - Based on 25 stations

Noticeable events summary

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

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