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Daily bulletin on solar and geomagnetic activity from the SIDC

Emesso: 2017 Oct 22 1231 UTC

SIDC Forecast

Brillamenti solari

C-class flares expected, (probability >=50%)

Geomagnetism

Quiet (A<20 and K<4)

Protoni solari

Quiet

	10cm flux	Ap
22 Oct 2017	077	008
23 Oct 2017	077	007
24 Oct 2017	077	007

Bulletin

New NOAA region 2685 (identical to returning region 2682, rotating into view at the East limb) is currently the only sunspot region on the solar disk as seen from Earth. Returning region 2683 produced a B3.3 flare from behind the East limb, peaking at 21:06 UT on October 21. A filament eruption near 20W 20N was observed in GONG and AIA images around 18:13 UT on October 21, apparently without corresponding Coronal Mass Ejection (CME). C flares are possible in the next 24 hours (55% probability), with a chance for an M flare (15% probability). No Earth-directed CMEs were observed in available coronagraphic imagery. The greater than 10 MeV proton flux was at nominal levels. Solar wind speed registered by DSCOVR increased from about 380 to a maximum of about 510 km/s around 2h UT on October 22, and then gradually decreased to current values around 430 km/s. The magnitude of the Interplanetary Magnetic Field (IMF) varied between about 2 and 12 nT, with current values around 3.5 nT. The IMF was directed towards the Sun and Bz had a negative excursion around -5 nT between about 21:30 and 23:30 UT. Quiet to active conditions (K Dourbes between 1 and 4; NOAA Kp between 1 and 3) were registered in the past 24 hours. Quiet to unsettled geomagnetic levels (K Dourbes < 4) are expected on October 22, 23 and 24.

Today's estimated international sunspot number (ISN): 012, based on 20 stations.

Solar indices for 21 Oct 2017

Wolf number Catania	///
10cm solar flux	077
AK Chambon La Forêt	021
AK Wingst	012
Estimated Ap	011
Estimated international sunspot number	012 - Based on 21 stations

Noticeable events summary

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

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