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Daily bulletin on solar and geomagnetic activity from the SIDC

Emesso: 2018 May 22 1304 UTC

SIDC Forecast

Brillamenti solari

Quiet conditions (<50% probability of C-class flares)

Geomagnetism

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

Protoni solari

Quiet

	10cm flux	Ap
22 May 2018	070	005
23 May 2018	071	014
24 May 2018	072	008

Bulletin

Solar activity was at low levels. Catania sunspot group 82 (NOAA AR 2710) produced one B2.8 flare peaking at 05:07 UT today. No earth- directed coronal mass ejections (CMEs) were observed in available coronagraphic imagery. The greater than 10 MeV proton flux was at nominal levels. Solar activity is expected to be at low levels with some probability for C-class flares. The solar wind speed remained below 400 km/s over the past 24 hrs. Interplanetary magnetic field magnitude remained below 5 nT till 11:00 UT today (recorded by ACE). Later interplanetray magnetic filed magnitude gradually increased till 9 nT, simutaniously Bz component decreased from -2 nT till -5 nT. Solar wind parameters variations may increase from now due to the expected influence of the recurrent positive polarity northern polar coronal hole. Solar wind speeds may increase till about 500 km/s later today or tomorrow (accodring to STEREO data). Geomagnetic conditions have been quiet over the past 24 hrs. Unsettled geomagnetic conditions can be expected today and tomorrow. Isolated episodes of active conditions are also not excluded.

Today's estimated international sunspot number (ISN): 013, based on 23 stations.

Solar indices for 21 May 2018

Wolf number Catania	013
10cm solar flux	070
AK Chambon La Forêt	007
AK Wingst	003
Estimated Ap	003
Estimated international sunspot number	011 - Based on 28 stations

Noticeable events summary

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

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