Viewing archive of Saturday, 17 December 2016

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2016 Dec 17 1230 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
17 Dec 2016	073	005
18 Dec 2016	072	012
19 Dec 2016	071	005

Bulletin

The only numbered sunspot group, NOAA AR 2618, is decaying while approaching the west solar limb. The last reported flare B2.1 (originating from the NOAA AR 2617) was more than 24 hours ago. We expect solar activity to remain on the same, very low level. No Earth directed CMEs were observed in the last 24 hours.

The Earth is still inside the slow solar wind with the speed of about 370 km/s, and the interplanetary magnetic field is 5nT. The fast solar wind associated with the low latitude extend of the northern polar coronal hole which reached central meridian in the afternoon of December 15, is expected to arrive at the Earth late on December 18, or early on December 19. The geomagnetic conditions are presently quiet. We expect quiet to possibly unsettled conditions in the coming hours.

Today's estimated international sunspot number (ISN): 012, based on 08 stations.

Solar indices for 16 Dec 2016

Wolf number Catania	///
10cm solar flux	073
AK Chambon La Forêt	004
AK Wingst	002
Estimated Ap	002
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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