Viewing archive of Friday, 24 August 2018

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2018 Aug 24 1230 UTC

SIDC Forecast

Solar flares

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

Geomagnetism

Minor storm expected (A>=30 or K=5)

Solar protons

Quiet

	10cm flux	Ap
24 Aug 2018	071	032
25 Aug 2018	072	034
26 Aug 2018	071	021

Bulletin

X-ray flux remained below B level throughout the period. NOAA AR 2719 revived (Cro, Beta-Gamma) and there is a new region emerging near N7W20 which appears a fairly simple bipolar region. X-ray flux is expected to remain below C level.

No new Earth directed CMEs were observed in coronagraph data.

Proton flux levels were at background values and are expected to remain so.

Solar wind speed declined further to around 360 km/s. A number of sudden density and magnetic field increases occurred since around 6:00UT. These are possibly representing the first signs of the August 20 CME. Total magnetic field grew to 7nT with recently a peak of Bz down to -6nT. Further increases of magnetic field strength can be anticipated with the possibility of periods of persistent Southward magnetic field orientation over the next 24 to 48 hours. Afterwards, Solar wind conditions should recover to nominal.

Geomagnetic conditions were quiet (both local K Dourbes and NOAA Kp 0-2). Active geomagnetic conditions and possibly minor geomagnetic storms must be anticipated over the next 24 to 48 hours.

Today's estimated international sunspot number (ISN): 029, based on 23 stations.

Solar indices for 23 Aug 2018

Wolf number Catania	///
10cm solar flux	070
AK Chambon La Forêt	006
AK Wingst	006
Estimated Ap	005
Estimated international sunspot number	016 - 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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