Viewing archive of Tuesday, 25 September 2018

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2018 Sep 25 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
25 Sep 2018	068	006
26 Sep 2018	068	007
27 Sep 2018	068	007

Bulletin

Solar activity was very low with X-ray flux remaining below B level and no spots on the visible disk. This is expected to remain so over the next days.

No Earth directed CMEs have been identified in coronagraph images.

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

Solar wind remained slightly elevated with solar wind speed within the 400-450 km/s range. Total magnetic field was 2-7nT with Bz variable. The magnetic field phi angle was mainly in the negative sector but seems to have switched into the positive sector recently. Solar wind speed is expected to remain slightly enhanced and may possible slightly increase under the influence of some patchy negative polarity open fields in the Southern hemisphere near the equator.

Geomagnetic conditions were quiet to unsettled (NOAA Kp 1-3 and local K Dourbes 1-2) and are expected to remain so.

Today's estimated international sunspot number (ISN): 000, based on 26 stations.

Solar indices for 24 Sep 2018

Wolf number Catania	000
10cm solar flux	069
AK Chambon La Forêt	012
AK Wingst	008
Estimated Ap	008
Estimated international sunspot number	000 - Based on 35 stations

Noticeable events summary

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

All times in UTC

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