Viewing archive of Tuesday, 4 September 2018

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2018 Sep 04 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
04 Sep 2018	068	005
05 Sep 2018	068	005
06 Sep 2018	068	012

Bulletin

Solar activity was at very low levels. No earth-directed coronal mass ejections (CMEs) were observed in the available coronagraphic imagery. The greater than 10 MeV proton flux was at nominal levels. A small negative polarity coronal hole is transiting the Central Meridian.

Solar activity is expected to remain at very low levels.

Around 22:45UT on 3 September, solar wind speed started a gradual increase from about 330 km/s to its current values around 400 km/s (DSCOVR). Bz varied between -7 and +5 nT, with a negative 1-hour stretch near -6 nT centered on 04:10UT. The direction of the interplanetary magnetic field was variable, being in a mostly positive sector (away from the Sun) after 05UT.

Quiet to unsettled geomagnetic conditions were observed and are expected to continue. On 6 and 7 September, active conditions are possible with the arrival of the co-rotating interaction region (CIR) and wind stream from the negative polarity CH.

Today's estimated international sunspot number (ISN): 000, based on 17 stations.

Solar indices for 03 Sep 2018

Wolf number Catania	000
10cm solar flux	068
AK Chambon La Forêt	010
AK Wingst	006
Estimated Ap	004
Estimated international sunspot number	000 - Based on 31 stations

Noticeable events summary

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

All times in UTC

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