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Daily bulletin on solar and geomagnetic activity from the SIDC

Emesso: 2018 May 24 1316 UTC

SIDC Forecast

Brillamenti solari

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

Geomagnetism

Quiet (A<20 and K<4)

Protoni solari

Quiet

	10cm flux	Ap
24 May 2018	073	004
25 May 2018	072	006
26 May 2018	073	007

Bulletin

Newly numbered Catania sunspot group 84 rotating around the East limb produced multiple B flares yesterday. The largest flare was a C2.0 flare peaking at 18:21 UT. NOAA Active Regions 2710 and 2711 were mostly inactive. 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. Solar wind parameters decreasing varitations indicate fainting influence of positive polarity extension of the northern polar coronal hole. Solar wind speed gradually decreased during the period till around 470 km/s after reaching maximum of 550 km/s at 17:00 UT yesterday. Total magnetic field magnitude declined from 6.5 to 2 nT, while Bz component is varying now between -1.7 and +1.7 nT. Geomagnetic conditions reached unsettled levels (K= 3) during 06 - 15 UT yesterday, then both local index (Dourbes) and planetary (NOAA) returned to quiet levels. Mainly quiet geomgnetic conditions can be expected from now.

Today's estimated international sunspot number (ISN): 035, based on 22 stations.

Solar indices for 23 May 2018

Wolf number Catania	031
10cm solar flux	073
AK Chambon La Forêt	012
AK Wingst	010
Estimated Ap	012
Estimated international sunspot number	027 - Based on 27 stations

Noticeable events summary

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

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