Viewing archive of Sunday, 18 November 2018

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2018 Nov 18 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
18 Nov 2018	073	005
19 Nov 2018	073	007
20 Nov 2018	073	004

Bulletin

There were no flares on the visible solar disc of the Sun in the past 24 hours. The chance for a C flare in the next 24 hours is estimated at 15%.

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.

In the past 24 hours, solar wind speed near Earth as registered by DSCOVR varied between about 275 and 340 km/s, with current values around 330 km/s. The Interplanetary Magnetic Field (IMF) was predominantly directed towards the Sun and has increased from about 4 to 7.5 nT since 04:45 UT on November 18. This may be the first sign of the arrival of a solar wind stream from a weak, negative polarity, equatorial coronal hole. Bz was never below -5 nT.

Quiet geomagnetic conditions (K Dourbes between 0 and 1; NOAA Kp between 0 and 1) were registered in the past 24 hours. Quiet to unsettled conditions (K Dourbes < 4) are expected on November 18, 19 and 20, with a chance for active intervals due to the possible arrival of a solar wind stream from a weak, negative polarity, equatorial coronal hole.

Today's estimated international sunspot number (ISN): 015, based on 16 stations.

Solar indices for 17 Nov 2018

Wolf number Catania	///
10cm solar flux	073
AK Chambon La Forêt	003
AK Wingst	001
Estimated Ap	001
Estimated international sunspot number	016 - Based on 29 stations

Noticeable events summary

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

All times in UTC

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