Viewing archive of Friday, 11 May 2018

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2018 May 11 1230 UTC

SIDC Forecast

Solar flares

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

Geomagnetism

Quiet (A<20 and K<4)

Solar protons

Quiet

	10cm flux	Ap
11 May 2018	070	009
12 May 2018	070	003
13 May 2018	069	003

Bulletin

Solar activity was at very low levels. Small and inactive region NOAA 2709 (Catania 81) remained the only visible sunspot region on the solar disk. 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 decreased from about 570 km/s to values near 460 km/s by the end of the period (DSCOVR). Bz varied between -5 and +2 nT, with a negative stretch during the 03-09UT interval and Bz dipping to -5.5 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 in response to Earth's gradual exit from the CH HSS. There remains a small chance on an isolated active interval.

Today's estimated international sunspot number (ISN): 011, based on 21 stations.

Solar indices for 10 May 2018

Wolf number Catania	011
10cm solar flux	070
AK Chambon La Forêt	018
AK Wingst	014
Estimated Ap	014
Estimated international sunspot number	012 - Based on 29 stations

Noticeable events summary

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

All times in UTC

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