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Daily bulletin on solar and geomagnetic activity from the SIDC

Emesso: 2017 Aug 21 1230 UTC

SIDC Forecast

Brillamenti solari

M-class flares expected (probability >=50%)

Geomagnetism

Active conditions expected (A>=20 or K=4)

Protoni solari

Quiet

	10cm flux	Ap
21 Aug 2017	086	015
22 Aug 2017	087	008
23 Aug 2017	088	007

Bulletin

Active Region (AR) 2671 (McIntosh class: Fkc; Mag.type: Beta- Gamma) has shown some evidence of flux emergence in HMI magnetogram observations; however it produced only B-class flares over the past 24 hours. The largest flare among them was a B9.3 flare peaking at 07:40UT today. New active region 2672 (McIntosh class: Dao; Mag.type: Beta) has rotated into view from the eastern limb today and already produced three C-class flares. The largest flare was C5.9 flare peaking at 03:16 UT. No Earth directed Coronal Mass Ejections (CMEs) have been detected. The greater than 10MeV proton flux remained at background levels over the past 24 hours. There are no potentially geoeffective coronal holes on the Sun. More C-class flares are expected over the next 24 hours with some probability of M-class flares. The solar wind speed has decreased from around 730 to 570 km/s over the past 24 hours. The total magnetic field strength has remained below 5 nT. The Bz component fluctuated between -4 and +4.5 nT. The geomagnetic field was at active to unsettled levels; Kp NOAA index ranged between 2-3 and local K index (Dourbes) between 1 and 4. Mostly quiet to unsettled geomagnetic conditions are expected for the next few days.

Today's estimated international sunspot number (ISN): 061, based on 19 stations.

Solar indices for 20 Aug 2017

Wolf number Catania	///
10cm solar flux	086
AK Chambon La Forêt	020
AK Wingst	023
Estimated Ap	027
Estimated international sunspot number	059 - Based on 26 stations

Noticeable events summary

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

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