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Daily bulletin on solar and geomagnetic activity from the SIDC

Vydáno: 2019 May 12 1230 UTC

SIDC Forecast

Sluneční erupce

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

Geomagnetism

Quiet (A<20 and K<4)

Sluneční protony

Quiet

	10cm flux	Ap
12 May 2019	076	013
13 May 2019	076	011
14 May 2019	075	007

Bulletin

X-ray flux remained below C level. Catania group 16 (NOAA AR 2740) continued to decay, while also Catania group 17 (NOAA AR 2741) remained inactive. X-ray flux is expected to remain below C level.

No new Earth directed CMEs have been detected in coronagraph data.

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

Solar wind showed the passage of the core of the May 6/7 CME. Solar wind speed was just around 350 km/s while total magnetic field showed a slow continuous decay from close to 10nT to the 6-7nT range. The magnetic field was strongly Southward starting from around -9nT with a similar continuous decaying trend in magnitude. Solar wind conditions should start to return towards nominal with the next significant increase not before noon, May 15 with the arrival of the May 11 CME.

Geomagnetic conditions reached active levels (both local K Dourbes and NOAA Kp reaching 4) in response to the persistently negative Bz of the interplanetary magnetic field. Geomagnetic conditions are expected to remain unsettled with an occasional active period initially possible, but returning to quiet to unsettled by the end of the period.

Today's estimated international sunspot number (ISN): 029, based on 20 stations.

Solar indices for 11 May 2019

Wolf number Catania	///
10cm solar flux	078
AK Chambon La Forêt	024
AK Wingst	///
Estimated Ap	030
Estimated international sunspot number	029 - Based on 20 stations

Noticeable events summary

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

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