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Daily bulletin on solar and geomagnetic activity from the SIDC

Emesso: 2017 Nov 18 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
18 Nov 2017	076	009
19 Nov 2017	077	014
20 Nov 2017	076	013

Bulletin

There are presently 2 numbered sunspot groups on the visible side of the solar disc, Catania sunspot group 63 (NOAA AR 2687) and group 64 (NOAA AR 2688). Solar flaring activity remains to be low without C-class flares reported. We expect such a low flaring activity to persist, isolated low C-class flares are possible but not very probable (probability of only about 10%). There were no Earth directed CMEs reported, and the solar protons remained at background level. The solar wind speed is presently about 410 km/s and the interplanetary magnetic field magnitude is about 4 nT. The fast solar wind associated with the large equatorial coronal hole (reached central meridian in the early morning of November 16) is expected to arrive at the Earth in the afternoon of November 19. The arrival of this fast flow might be preceded with the solar wind speed increase expected to start later today (associated with the low latitude extension of the southern polar coronal hole which reached central meridian in the late evening of November 13). The geomagnetic conditions are presently quiet, we expect unsettled to active geomagnetic conditions tomorrow due to the arrival of the fast solar wind.

Today's estimated international sunspot number (ISN): 015, based on 12 stations.

Solar indices for 17 Nov 2017

Wolf number Catania	031
10cm solar flux	076
AK Chambon La Forêt	008
AK Wingst	004
Estimated Ap	004
Estimated international sunspot number	023 - Based on 32 stations

Noticeable events summary

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

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