Viewing archive of Monday, 26 March 2018

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2018 Mar 26 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
26 Mar 2018	068	014
27 Mar 2018	068	010
28 Mar 2018	068	011

Bulletin

There are no sunspot regions on the visible hemisphere of the Sun and flaring level is very low. The chance for a C flare in the next 24 hours is estimated at 3%.

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 was enhanced due to the influence of a negative polarity coronal hole (CH) wind stream. Solar wind speed measured by DSCOVR gradually increased from about 450 to 500 km/s until it suddenly increased to about 540 km/s at 7:12 UT on March 26. Current values lie around 520 km/s. The Interplanetary Magnetic Field (IMF) was directed towards the Sun and its magnitude varied between about 1 and 8 nT. Bz was never below -5.5 nT. A returning, positive polarity, north polar CH is currently at the Central Meridian and may cause enhanced solar wind conditions on March 29, 30 and 31.

Quiet to active geomagnetic conditions (K Dourbes between 2 and 4; NOAA Kp between 2 and 4) were registered in the past 24 hours. Quiet to active levels (K Dourbes < 5) are expected on March 26, 27 and 28 in response to the continuing CH wind stream, with a slight chance for minor storm intervals (K Dourbes = 5).

Today's estimated international sunspot number (ISN): 000, based on 24 stations.

Solar indices for 25 Mar 2018

Wolf number Catania	///
10cm solar flux	068
AK Chambon La Forêt	029
AK Wingst	018
Estimated Ap	020
Estimated international sunspot number	000 - Based on 31 stations

Noticeable events summary

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

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