Viewing archive of Saturday, 25 March 2017

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2017 Mar 25 1231 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
25 Mar 2017	072	008
26 Mar 2017	072	024
27 Mar 2017	072	024

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. Over the past 24 hours, solar wind speed measured by DSCOVR decreased from about 570 to 495 km/s, while the magnitude of the Interplanetary Magnetic Field (IMF) ranged between about 1 and 5 nT. This is indicative of a transition to nominal solar wind conditions after the passage of the high speed stream from a positive coronal hole. Quiet geomagnetic conditions (K Dourbes between 1 and 2; NOAA Kp between 0 and 2) were registered in the past 24 hours. Quiet to unsettled geomagnetic conditions (K Dourbes < 4) are expected on March 25 and 26. The arrival of a high speed stream from a large, recurrent coronal hole is expected on March 27. Consequently, active geomagnetic conditions (K Dourbes = 4) are possible, with a chance for minor geomagnetic storm intervals (K Dourbes = 5).

Today's estimated international sunspot number (ISN): 016, based on 24 stations.

Solar indices for 24 Mar 2017

Wolf number Catania	///
10cm solar flux	072
AK Chambon La Forêt	008
AK Wingst	006
Estimated Ap	005
Estimated international sunspot number	013 - Based on 27 stations

Noticeable events summary

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

All times in UTC

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