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Daily bulletin on solar and geomagnetic activity from the SIDC

Vydáno: 2020 Oct 16 1230 UTC

SIDC Forecast

Sluneční erupce

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

Geomagnetism

Quiet (A<20 and K<4)

Sluneční protony

Quiet

	10cm flux	Ap
16 Oct 2020	074	005
17 Oct 2020	074	006
18 Oct 2020	074	005

Bulletin

Solar activity is low with only two low B-class flares reported in the last 24 hours. The stronger, B 1.5 flare peaked at 10:20 UT this morning. From the available observations it seems that it originated from the Catania sunspot group 44 (NOAA AR region 2775) which is presently situated at the West solar limb and marked yesterday as spotless. The Catania sunspot group 45, which rotated on the visible side of the Sun yesterday, has presently beta configuration of its photospheric magnetic field and could be the source of more B-class flares and possibly, but not very probably, also an isolated low C-class flares. The available coronagraph data do not show any possibly Earth directed CMEs. During the last 24 hours the proton flux levels remain at the background values.

The in situ observations show simultaneous increase of the solar wind speed, density, temperature and interplanetary magnetic field magnitude starting from 15:00 UT on October 15. This could be signatures or either faint ICME (of presently unclear Solar counterpart) or the corotating interaction region. More will be reported when larger interval of data will be available. Presently the solar wind speed is about 310 km/s and the interplanetary magnetic field magnitude is about 4 nT. The geomagnetic conditions are quiet, and we expect quiet to possibly unsettled geomagnetic conditions in the coming hours.

Today's estimated international sunspot number (ISN): 013, based on 12 stations.

Solar indices for 15 Oct 2020

Wolf number Catania	///
10cm solar flux	074
AK Chambon La Forêt	007
AK Wingst	002
Estimated Ap	002
Estimated international sunspot number	013 - Based on 24 stations

Noticeable events summary

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

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