Viewing archive of Wednesday, 5 September 2018

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2018 Sep 05 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
05 Sep 2018	067	013
06 Sep 2018	068	015
07 Sep 2018	068	015

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 has transited the Central Meridian.

Solar activity is expected to remain at very low levels.

Solar wind speed continued its gradual increase from an initial 400 km/s to values around 500 km/s by the end of the period (DSCOVR). Bz varied mostly between -6 and +5 nT, with a negative stretch from 21UT till 01UT. The direction of the interplanetary magnetic field was mostly in a positive sector (away from the Sun) until about 09UT, after which it was directed more towards the Sun.

Quiet to unsettled geomagnetic conditions were observed, with Kp recording an isolated active episode during the 00-03UT interval. Quiet to unsettled geomagnetic conditions are expected. Chances on active episodes are likely to increase on 6 and 7 September in response to the expected arrival of the co-rotating interaction region (CIR) and wind stream from the negative polarity CH. A minor storming episode is not excluded.

Today's estimated international sunspot number (ISN): 000, based on 21 stations.

Solar indices for 04 Sep 2018

Wolf number Catania	000
10cm solar flux	068
AK Chambon La Forêt	020
AK Wingst	013
Estimated Ap	012
Estimated international sunspot number	000 - 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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