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Daily bulletin on solar and geomagnetic activity from the SIDC

Emesso: 2017 Jul 31 1231 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
31 Jul 2017	073	013
01 Aug 2017	075	013
02 Aug 2017	075	007

Bulletin

Returning Active Region NOAA 2665 produced a B9.2 flare which peaked at 9:12 UT on July 31. C flares from NOAA 2665 are possible in the next 48 hours, with a chance for M flares. No earth-directed Coronal Mass Ejections (CMEs) were observed in available coronagraphic imagery. The greater than 10 MeV proton flux was at nominal levels.

Solar wind speed measured by DSCOVR varied between about 320 and 380 km/s in the past 24 hours. Bz oscillated between about -5 and 4 nT. The Interplanetary Magnetic Field (IMF) was directed away from the Sun and its magnitude ranged between about 1 and 7 nT. Quiet geomagnetic conditions (K Dourbes between 0 and 2; NOAA Kp between 0 and 1) were registered in the past 24 hours. Active levels (K Dourbes = 4) are possible on July 31, August 1 and 2 due to the expected arrival of a high speed stream from a small negative equatorial coronal hole, with a slight chance for minor storm conditions (K Dourbes = 5).

Today's estimated international sunspot number (ISN): 000, based on 25 stations.

Solar indices for 30 Jul 2017

Wolf number Catania	///
10cm solar flux	070
AK Chambon La Forêt	007
AK Wingst	005
Estimated Ap	005
Estimated international sunspot number	014 - Based on 26 stations

Noticeable events summary

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

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