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Daily bulletin on solar and geomagnetic activity from the SIDC

Emesso: 2017 Aug 23 1231 UTC

SIDC Forecast

Brillamenti solari

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

Geomagnetism

Minor storm expected (A>=30 or K=5)

Protoni solari

Quiet

	10cm flux	Ap
23 Aug 2017	090	025
24 Aug 2017	091	012
25 Aug 2017	092	005

Bulletin

Over the past 24 hours several C-class flares have been detected. The most energetic flares were two C1.9 class flares, produced by NOAA Active Region (AR) 2671. NOAA AR 2672 and Catania Sunspot group 44 produced only B-class flares. No Earth directed Coronal Mass Ejections (CMEs) have been detected. More C-class flares are expected during the next 24 hours, with a small chance of M-class flare.

Geomagnetic conditions have been disturbed due to the long period of negative Bz since early today, Kp reached 4 during 03-09 UT; the local K Dourbes also went up to 4 today. Solar wind speed is increasing again from 04 UT today and currently around 490 km/s. Simultaneously interplanetary magnetic field intensity is increasing and currently around 7.5 nT; Bz is constantly decreasing till actual value of -6 nT. Therefore, more disturbed conditions are expected in the next 24 hours with Kp up to 5.

Today's estimated international sunspot number (ISN): 066, based on 15 stations.

Solar indices for 22 Aug 2017

Wolf number Catania	058
10cm solar flux	090
AK Chambon La Forêt	023
AK Wingst	021
Estimated Ap	023
Estimated international sunspot number	059 - Based on 29 stations

Noticeable events summary

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

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