Viewing archive of Wednesday, 9 May 2018

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2018 May 09 1230 UTC

SIDC Forecast

Solar flares

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

Geomagnetism

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

Solar protons

Quiet

	10cm flux	Ap
09 May 2018	070	011
10 May 2018	070	010
11 May 2018	069	005

Bulletin

Solar activity was at very low levels. Active region NOAA 2708 regained some sunspot area, while NOAA 2709 (Catania 81) was stable. 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 remain at very low levels.

Earth remained under the influence of the high speed stream (HSS) from an elongated negative polarity equatorial coronal hole (CH). Solar wind speed varied mostly between 620 and 700 km/s, and was at values near 620 km/s by the end of the period (DSCOVR). Bz varied between -6 and +5 nT. The interplanetary magnetic field was mostly directed towards the Sun. Geomagnetic activity ranged from quiet to active levels.

Quiet to unsettled geomagnetic conditions are expected, with a chance on an isolated active interval.

Today's estimated international sunspot number (ISN): 023, based on 22 stations.

Solar indices for 08 May 2018

Wolf number Catania	022
10cm solar flux	070
AK Chambon La Forêt	027
AK Wingst	017
Estimated Ap	018
Estimated international sunspot number	020 - Based on 32 stations

Noticeable events summary

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

All times in UTC

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