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Daily bulletin on solar and geomagnetic activity from the SIDC

Emesso: 2017 Aug 25 1230 UTC

SIDC Forecast

Brillamenti solari

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

Geomagnetism

Quiet (A<20 and K<4)

Protoni solari

Quiet

	10cm flux	Ap
25 Aug 2017	078	005
26 Aug 2017	077	007
27 Aug 2017	076	007

Bulletin

Active Region (AR) 2672 (McIntosh class: Esi; Mag.type: Beta- Gamma) produced C5.5 flare peaking at 07:27 UT today. AR 2671 (McIntosh class: Fsi; Mag.type: Beta-Gamma) produced multiple B-class flares during the past 24 hours; the largest flare was B8.4 flare peaking at 15:58 UT yesterday. No Earth directed Coronal Mass Ejections (CMEs) have been detected in available coronagraph imagery. Solar activity is expected to be at C-class flaring level for the next three days. Solar wind parameters variations decayed over the past 24 hours. The solar wind speed decreased from 410 to 350 km/s. The total magnetic field strength remained below 5.5 nT. The Bz component fluctuated around 0 nT but was mainly positive, ranging between -3.5 and +4 nT. Geomagnetic conditions ranged between Kp index 1-3 (NOAA) and local K index 0-3 (Dourbes) over the past 24 hours. Geomagnetic conditions are expected to be mostly quiet with some isolated episodes of Kp=3.

Today's estimated international sunspot number (ISN): 050, based on 24 stations.

Solar indices for 24 Aug 2017

Wolf number Catania	050
10cm solar flux	079
AK Chambon La Forêt	010
AK Wingst	010
Estimated Ap	012
Estimated international sunspot number	052 - Based on 29 stations

Noticeable events summary

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

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