Viewing archive of Friday, 23 March 2018

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2018 Mar 23 1231 UTC

SIDC Forecast

Solar flares

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

Geomagnetism

Minor storm expected (A>=30 or K=5)

Solar protons

Quiet

	10cm flux	Ap
23 Mar 2018	068	013
24 Mar 2018	068	029
25 Mar 2018	068	023

Bulletin

Solar activity remained at very low levels. The Sun is spotless. No earth-directed coronal mass ejections (CMEs) were observed in available coronagraphic imagery. The greater than 10 MeV proton flux was at nominal levels.

Solar activity is expected to stay at very low levels.

Solar wind parameters were at nominal levels until about 16UT, when solar wind became enhanced. Bz turned mostly southward and was at a steady -7 nT from 17UT till 21UT, with short-lived excursions to +8 nT and -9 nT just prior to 20UT (DSCOVR). This coincided with a more firm increase in temperature and speed, the latter gradually rising from about 340 km/s to 460 km/s at 08 UT. Currently, Bz is varying between -3 nT and +2 nT, with wind speeds steady near 440 km/s. The interplanetary magnetic field was predominantly directed towards the Sun. Geomagnetic activity was at quiet to unsettled levels, with an isolated active period observed in Kp (00-03UT) and by Dourbes (18-21UT).

Quiet to unsettled geomagnetic conditions are expected with a chance on another active episode. Minor storming intervals are possible on 24 and 25 March as a result of the expected arrival of the wind stream associated with the extension of the negative polarity southern polar CH.

Today's estimated international sunspot number (ISN): 000, based on 14 stations.

Solar indices for 22 Mar 2018

Wolf number Catania	///
10cm solar flux	069
AK Chambon La Forêt	021
AK Wingst	007
Estimated Ap	007
Estimated international sunspot number	000 - Based on 20 stations

Noticeable events summary

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

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