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Daily bulletin on solar and geomagnetic activity from the SIDC

Emesso: 2016 Nov 19 1230 UTC

SIDC Forecast

Brillamenti solari

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

Geomagnetism

Quiet (A<20 and K<4)

Protoni solari

Quiet

	10cm flux	Ap
19 Nov 2016	078	007
20 Nov 2016	078	017
21 Nov 2016	078	008

Bulletin

Solar activity was very low with X-ray flux below C-level and only a single B1.9 flare observed from NOAA region 2611 in the Eastern hemisphere. Decay was observed in both NOAA regions 2610 and 2611. There is only a slight chance for C flaring over the next days. Proton flux values were at background levels and expected to remain so. No Earth directed CMEs have been observed in coronagraph data. The Southward extension of the Northern polar coronal hole, which in previous rotations extended over the equator appears, is now confined above 20 degrees North. The much smaller remaining positive polarity coronal hole on the equator, which was previously connected to the Northern polar coronal hole, will only transit the central meridian around midnight November 20-21.

Solar wind has not yet seen the expected increase due to the positive polarity equatorial coronal hole. Solar wind speed even further decreased to around a minimum of 300 km/s and currently is around 320 km/s. Total magnetic field remained in the 3-5 nT range with a slight increase to 6 nT at the end of the period. Bz was variable and the phi angle still in the negative sector. Today should see the switch into a positive sector and an increase in solar wind parameters under the influence of the positive polarity equatorial coronal hole.

Geomagnetic conditions were quiet (local K Dourbes 0-1 and NOAA Kp 0-2) and will become quiet to unsettled as solar wind speed increases.

Today's estimated international sunspot number (ISN): 027, based on 09 stations.

Solar indices for 18 Nov 2016

Wolf number Catania	///
10cm solar flux	078
AK Chambon La Forêt	005
AK Wingst	003
Estimated Ap	004
Estimated international sunspot number	031 - Based on 20 stations

Noticeable events summary

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

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