Viewing archive of Saturday, 31 March 2018

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2018 Mar 31 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
31 Mar 2018	069	009
01 Apr 2018	069	007
02 Apr 2018	069	007

Bulletin

Alpha region NOAA AR 2703 has produced a few low B flares and a B7.1 flare in the past 24 hours. The chance for a C flare in the next 24 hours is estimated at 40%, mainly from AR 2703.

No Earth-directed Coronal Mass Ejections (CMEs) were observed in available coronagraphic imagery.

The greater than 10 MeV proton flux was at nominal levels in the past 24 hours, and is expected to stay at nominal levels in the next 24 hours.

Solar wind near Earth showed continued weak signs of influence from the positive polarity, northern polar Coronal Hole (CH) wind stream. Solar wind speed as registered by DSCOVR varied between about 380 and 470 km/s. The Interplanetary Magnetic Field (IMF) was directed away from the Sun and its magnitude varied between about 2 and 9 nT. There were no prolonged intervals with Bz below -5 nT.

Quiet geomagnetic conditions (K Dourbes between 0 and 2; NOAA Kp between 1 and 3) were registered in the past 24 hours. Quiet to unsettled geomagnetic levels (K Dourbes < 4) are expected on March 31 and April 1 and 2. On March 31, there is a chance for active intervals (K Dourbes = 4) under the continued influence of the wind stream from a positive polarity, northern polar CH.

Today's estimated international sunspot number (ISN): 012, based on 13 stations.

Solar indices for 30 Mar 2018

Wolf number Catania	014
10cm solar flux	069
AK Chambon La Forêt	010
AK Wingst	004
Estimated Ap	004
Estimated international sunspot number	012 - Based on 22 stations

Noticeable events summary

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

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