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Daily bulletin on solar and geomagnetic activity from the SIDC

Существующий: 2020 Oct 17 1231 UTC

SIDC Forecast

Солнечные вспышки

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

Geomagnetism

Quiet (A<20 and K<4)

Солнечные протоны

Quiet

	10cm flux	Ap
17 Oct 2020	075	006
18 Oct 2020	074	005
19 Oct 2020	074	006

Bulletin

During last 24 hours Catania sunspot group 44 (NOAA AR region 2775), situated at that moment at the West solar limb, was a source of two impulsive C-class flares and number of low B-class flares. The Catania sunspot group 45 (NOAA AR region 2776) was source of only few B-class flares, during last 24 hours. As this sunspot groups still has beta configuration of its photospheric magnetic field, it could be the source of the B-class flares and possibly, but not very probably also isolated C-class flares in the coming hours. The C-class flares originating from the Catania sunspot group 44 were associated with CMEs (projected speeds reported by CACTUS software were about 600 km/s). Since both CMEs were rather narrow and originated from the region on, and partially behind the West solar limb, we do not expected them to arrive to Earth. During the last 24 hours the proton flux levels remain at the background values.

The solar wind speed is presently about 330 km/s. The interplanetary magnetic field magnitude is fluctuating between 3 and 9 nT, and its present value is about 8 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): 012, based on 11 stations.

Solar indices for 16 Oct 2020

Wolf number Catania	014
10cm solar flux	075
AK Chambon La Forêt	007
AK Wingst	006
Estimated Ap	004
Estimated international sunspot number	012 - Based on 23 stations

Noticeable events summary

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

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