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Daily bulletin on solar and geomagnetic activity from the SIDC

Emesso: 2017 Aug 24 1309 UTC

SIDC Forecast

Brillamenti solari

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

Geomagnetism

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

Protoni solari

Quiet

	10cm flux	Ap
24 Aug 2017	085	016
25 Aug 2017	084	008
26 Aug 2017	085	007

Bulletin

Active Region (AR) 2671 (McIntosh class: Fsi; Mag.type: Beta- Gamma) and AR 2672 (McIntosh class: Esi; Mag.type: Beta-Gamma) produced three C-class flares during the past 24 hours. The largest flare was C2.2 flare peaking at 13:43 UT yesterday. 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. Solar wind parameters remained elevated over the past 24 hours. Total interplanetary magnetic field strength varied between 2 and 9 nT. The Bz component was mostly negative with a maximum southward deflection of -7.5 nT. Solar wind speed slightly decreased from about 620 till 413 km/s (at 12:30 UT) over the past 24 hours. Geomagnetic conditions have been disturbed due to the long period of negative Bz; Kp reached 5 at 15 UT and returned to Kp = 3 at 21 UT yesterday; the local K Dourbes also went up to 4. The geomagnetic environment is expected to be at unsettled to active levels today and tomorrow.

Today's estimated international sunspot number (ISN): 052, based on 22 stations.

Solar indices for 23 Aug 2017

Wolf number Catania	065
10cm solar flux	085
AK Chambon La Forêt	034
AK Wingst	024
Estimated Ap	027
Estimated international sunspot number	066 - Based on 26 stations

Noticeable events summary

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

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