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Daily bulletin on solar and geomagnetic activity from the SIDC

Випущено: 2018 May 29 1230 UTC

SIDC Forecast

Сонячні спалахи

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

Geomagnetism

Quiet (A<20 and K<4)

Сонячні протони

Quiet

	10cm flux	Ap
29 May 2018	076	004
30 May 2018	075	007
31 May 2018	075	010

Bulletin

Beta region NOAA AR 2712 produced a C2.7 flare at 17:10 UT on May 28. The chance for a C flare in the next 24 hours is estimated at 40%.

No Earth-directed Coronal Mass Ejections (CMEs) were observed in available coronagraphic imagery.

The greater than 10 MeV proton flux was at nominal levels in the past 24 hours, and is expected to stay at nominal levels in the next 24 hours.

Solar wind speed near Earth as registered by DSCOVR varied between about 360 and 420 km/s in the past 24 hours. The Interplanetary Magnetic Field (IMF) was predominantly directed away from the Sun and its magnitude varied between about 1 and 9 nT. Bz was never below -5 nT. A negative polarity equatorial coronal hole is currently at the central meridian. The high speed stream associated with this coronal hole may arrive near Earth late on May 31 or on June 1.

Quiet geomagnetic conditions (K Dourbes between 1 and 2; NOAA Kp between 1 and 2) were registered in the past 24 hours. Quiet to unsettled levels (K Dourbes < 4) are expected on March 29, 30 and 31, with a chance for active to minor storm intervals (K Dourbes between 4 and 5) late on May 31 due to the expected arrival of the solar wind stream associated with the equatorial coronal hole.

Today's estimated international sunspot number (ISN): 024, based on 18 stations.

Solar indices for 28 May 2018

Wolf number Catania	022
10cm solar flux	077
AK Chambon La Forêt	008
AK Wingst	007
Estimated Ap	005
Estimated international sunspot number	020 - Based on 31 stations

Noticeable events summary

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

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