Viewing archive of Saturday, 17 March 2018

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2018 Mar 17 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
17 Mar 2018	068	024
18 Mar 2018	068	029
19 Mar 2018	068	012

Bulletin

Solar X ray flux remained below B level. NOAA active region 2701 decayed shortly after emerging but meanwhile a new, yet unnumbered, bipolar region is forming around N20W33. Solar X-ray flux is still expected to remain below C level.

No Earth directed CMEs have been observed in coronagraph data.

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

Solar wind remained enhanced with solar wind speed first declining to around 420km/s before increasing again to around 500 km/s currently. Total magnetic field reached a maximum of 13nT in the afternoon of March 16 but meanwhile declined to nominal values of around 5nT. The magnetic field phi angle was steady in the negative sector. Enhanced solar wind conditions are expected to continue at least today and into tomorrow under the influence of the negative polarity coronal hole in the northern hemisphere.

Geomagnetic conditions were quiet to active (local K Dourbes 1-4, NOAA Kp 3-4). Active geomagnetic conditions are still to be expected today and tomorrow.

Today's estimated international sunspot number (ISN): 000, based on 04 stations.

Solar indices for 16 Mar 2018

Wolf number Catania	000
10cm solar flux	069
AK Chambon La Forêt	037
AK Wingst	022
Estimated Ap	024
Estimated international sunspot number	000 - Based on 25 stations

Noticeable events summary

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

All times in UTC

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