Viewing archive of Saturday, 12 May 2018

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2018 May 12 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
12 May 2018	070	011
13 May 2018	070	006
14 May 2018	070	005

Bulletin

Solar activity was at very low levels. Small and inactive region NOAA 2709 (Catania 81) doubled its number of sunspots to 2. 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 wind stream from an elongated negative polarity equatorial coronal hole (CH). Solar wind speed first decreased from about 480 km/s to 420 km/s by 23UT, then started a gradual increase to values near 520 km/s by the end of the period (DSCOVR). Bz varied between -6 and +4 nT, and was predominately negative until about 04UT. The interplanetary magnetic field was mainly directed towards the Sun. Geomagnetic activity ranged from quiet to mostly unsettled levels in Dourbes, with Kp recording 3 active intervals.

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

Today's estimated international sunspot number (ISN): 013, based on 18 stations.

Solar indices for 11 May 2018

Wolf number Catania	011
10cm solar flux	070
AK Chambon La Forêt	026
AK Wingst	016
Estimated Ap	017
Estimated international sunspot number	011 - Based on 28 stations

Noticeable events summary

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

All times in UTC

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