Viewing archive of Sunday, 20 November 2016

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2016 Nov 20 1232 UTC

SIDC Forecast

Solar flares

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

Geomagnetism

Quiet (A<20 and K<4)

Solar protons

Quiet

	10cm flux	Ap
20 Nov 2016	077	011
21 Nov 2016	077	013
22 Nov 2016	077	007

Bulletin

Solar activity was very low with X-ray flux remaining below C level and just a single B1.1 flare observed from NOAA region 2611. NOAA region 2610 has decayed and also region 2611 is continuing to decay. There is only a very minor chance for C-flares. Proton flux values are at background levels and expected to remain so. No Earth directed CMEs have been observed in coronagraph data. A positive polarity equatorial coronal hole is starting to cross the central meridian and can be expected to become geoeffective starting late November 23, early November 24.

Solar wind speed has remained low around 320 km/s for most of the period and only started its expected increase around the end of the period to around 350-370 km/s. Total magnetic field fluctuated between 1 and 5.5nT and increased to around 7 nT at the end of the period. Bz was variable. The magnetic field phi angle shifted into the positive sector during the second half of the period. Solar wind speed is expected to further increase under influence of a positive polarity coronal hole.

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

Today's estimated international sunspot number (ISN): 007, based on 11 stations.

Solar indices for 19 Nov 2016

Wolf number Catania	///
10cm solar flux	077
AK Chambon La Forêt	005
AK Wingst	002
Estimated Ap	002
Estimated international sunspot number	015 - Based on 22 stations

Noticeable events summary

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

All times in UTC

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