Viewing archive of Thursday, 6 September 2018

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2018 Sep 06 1445 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
06 Sep 2018	067	009
07 Sep 2018	068	015
08 Sep 2018	068	010

Bulletin

Solar activity was at very low levels. The Sun was spotless again. 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 positive polarity coronal hole (CH) is approaching the Central Meridian.

Solar activity is expected to remain at very low levels.

Solar wind speed increased from an initial 490 km/s to a maximum of about 510 km/s around 13UT, before gradually declining to its current values just above 400 km/s (DSCOVR). Bz softened from -6 nT at the beginning of the period to a more stable range between -3 and +2 nT after 18UT. The direction of the interplanetary magnetic field was mostly in a positive sector (away from the Sun), with some negative excursions.

Quiet to unsettled geomagnetic conditions were observed, with K Dourbes recording an isolated active episode during the 10-13UT interval on 5 September. Quiet to active geomagnetic conditions are expected in response to the arrival later today or tomorrow (7 September) 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 05 Sep 2018

Wolf number Catania	000
10cm solar flux	068
AK Chambon La Forêt	014
AK Wingst	014
Estimated Ap	014
Estimated international sunspot number	000 - Based on 30 stations

Noticeable events summary

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

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