Viewing archive of Tuesday, 13 December 2016

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2016 Dec 13 1234 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
13 Dec 2016	071	006
14 Dec 2016	070	008
15 Dec 2016	069	015

Bulletin

Solar activity continues to be low without C-class flares reported since December 10. The only active region presently observed on the visible side of the solar disc, NOAA 2617, has approached to the west solar limb. We expect solar activity to stay at the same low level, and although the isolated C-class flares are possible they are not very probable. Newly available observations confirm that the CME, first seen in the SOHO LASCO C2 field of view at 06:48 UT on December 11, was a back side event and will therefore not arrive at the Earth. No Earth directed CMEs were observed in the last 24 hours.

The solar wind speed remains to be about 530 km/s, and the interplanetary magnetic field magnitude is presently about 4 nT. The fast solar wind associated with the small equatorial coronal hole which reached the central meridian yesterday morning is expected to arrive at the Earth in the midday of December 15. It might be closely followed in arrival time by the fast flow from the small coronal hole (between S08 and S12) which reached the central meridian early this morning. The geomagnetic conditions are presently quiet and we expect them to stay so in the coming hours.

Today's estimated international sunspot number (ISN): 014, based on 08 stations.

Solar indices for 12 Dec 2016

Wolf number Catania	013
10cm solar flux	071
AK Chambon La Forêt	008
AK Wingst	005
Estimated Ap	004
Estimated international sunspot number	013 - Based on 16 stations

Noticeable events summary

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

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