Viewing archive of Tuesday, 17 September 2019

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2019 Sep 17 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
17 Sep 2019	068	014
18 Sep 2019	068	017
19 Sep 2019	068	008

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.

The filament eruption reported yesterday was associated with a very narrow and slow CME towards the West as seen by STEREO A COR2. SoHO/LASCO C2 and C3 coronagraph images show a slow and East directed CME. Based on these observations we judge that the ejecta are sufficiently East of the Sun- Earth line and no impact on Earth is expected. There were no other Earth-directed CMEs observed in coronagraph data.

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

Solar wind speed has overall decreased to between 350-400 km/s with total magnetic field around a nominal 5nT. Bz was mostly positive and the magnetic field phi angle mostly indicated a negative sector connection with some periods in the positive sector. By the end of the day Solar wind conditions may become enhanced under the influence of a Southern hemisphere coronal hole.

Geomagnetic conditions were mostly quiet to unsettled (local K Dourbes 0-3) with an isolated active period (NOAA Kp 4) after midnight. Geomagnetic conditions are expected to be unsettled with isolated active periods possible.

Today's estimated international sunspot number (ISN): 000, based on 25 stations.

Solar indices for 16 Sep 2019

Wolf number Catania	000
10cm solar flux	069
AK Chambon La Forêt	015
AK Wingst	014
Estimated Ap	015
Estimated international sunspot number	000 - Based on 20 stations

Noticeable events summary

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

All times in UTC

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