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Daily bulletin on solar and geomagnetic activity from the SIDC

Emesso: 2019 Dec 11 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
11 Dec 2019	071	006
12 Dec 2019	070	007
13 Dec 2019	070	007

Bulletin

Visible side of the solar disc is spotless. There were no flares reported for number of days and we do not expect any flaring activity in the coming hours. Narrow and slow, but well defined CME reported yesterday (observed in the SOHO LASCO C2 field of view at about 19:06 UT on December 09) was associated with the brightening and small dimming at about 18:11 UT (situate at S05 W25). It is not probable that this CME will arrive to the Earth. During last 24 hours there were no Earth directed CMEs and the solar protons remained at the background level.

The solar wind speed is presently about 420 km/s and the interplanetary magnetic field magnitude is 5 nT. It is not completely clear what is the magnetic structure observed in the in situ data, and reported yesterday. It seems like the arrival of the weak ICME was followed yesterday afternoon by the solar wind originating from the negative polarity coronal hole. The structure observed in the solar wind data did not induced disturbed geomagnetic conditions. The narrow and extended equatorial coronal hole of negative polarity has reached central meridian yesterday evening. The fast solar wind associated with this coronal hole might arrive to the Earth late on December 14. The geomagnetic conditions are presently quiet and we expect them to stay so in the coming hours.

Today's estimated international sunspot number (ISN): 000, based on 13 stations.

Solar indices for 10 Dec 2019

Wolf number Catania	///
10cm solar flux	071
AK Chambon La Forêt	007
AK Wingst	004
Estimated Ap	002
Estimated international sunspot number	000 - Based on 30 stations

Noticeable events summary

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

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