Viewing archive of Sunday, 21 May 2017

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2017 May 21 1230 UTC

SIDC Forecast

Solar flares

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

Geomagnetism

Active conditions expected (A>=20 or K=4)

Solar protons

Quiet

	10cm flux	Ap
21 May 2017	072	016
22 May 2017	072	019
23 May 2017	072	010

Bulletin

In the past 24 hours, no C flares were observed. Very low solar activity (no C flares) is expected in the next 24 hours. Solar wind speed measured by DSCOVR decreased from about 700 to 660 km/s in the past 24 hours, while the magnitude of the Interplanetary Magnetic Field (IMF) varied between about 3 and 7 nT. Quiet to active geomagnetic conditions (K Dourbes between 2 and 4; NOAA Kp between 3 and 4) were registered in the past 24 hours. Active levels (K Dourbes = 4) are possible on May 21 and 22, with a chance for minor storm intervals (K Dourbes = 5). Quiet to unsettled conditions are expected on May 23, with a chance for active intervals.

Today's estimated international sunspot number (ISN): 031, based on 22 stations.

Solar indices for 20 May 2017

Wolf number Catania	///
10cm solar flux	072
AK Chambon La Forêt	029
AK Wingst	024
Estimated Ap	023
Estimated international sunspot number	030 - Based on 32 stations

Noticeable events summary

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

All times in UTC

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