Viewing archive of Wednesday, 18 September 2019

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2019 Sep 18 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
18 Sep 2019	068	013
19 Sep 2019	068	008
20 Sep 2019	067	007

Bulletin

Solar X ray flux remained below B level throughout the period. With a spotless disk, X-ray flux is expected to remain at or below background levels.

There were no Earth-directed CMEs observed in coronagraph data.

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

Solar wind conditions were near nominal with solar wind slightly increasing to between 400-450 km/s and total magnetic field in the 2-7nT range. The magnetic field phi angle switched to the positive sector around 20:30UT. There was a possibility of enhanced solar wind conditions under the possible influence of a negative polarity coronal hole in the southern hemisphere, but this does not seem to occur. Solar wind conditions are expected to remain near nominal.

Geomagnetic conditions were quiet to active (NOAA Kp and local K Dourbes 1-4). Geomagnetic conditions are expected to be quiet to unsettled with initially an isolated active period still possible.

Today's estimated international sunspot number (ISN): 000, based on 28 stations.

Solar indices for 17 Sep 2019

Wolf number Catania	000
10cm solar flux	068
AK Chambon La Forêt	016
AK Wingst	011
Estimated Ap	011
Estimated international sunspot number	000 - Based on 29 stations

Noticeable events summary

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

All times in UTC

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