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Daily bulletin on solar and geomagnetic activity from the SIDC

Emesso: 2017 Aug 02 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
02 Aug 2017	074	010
03 Aug 2017	074	007
04 Aug 2017	074	020

Bulletin

In the past 24 hours, returning Active Region NOAA 2665 produced a few low B flares. C flares from NOAA 2665 are possible in the next 48 hours, with a chance for an M flare. No earth-directed Coronal Mass Ejections (CMEs) were observed in available coronagraphic imagery. The greater than 10 MeV proton flux was at nominal levels. In the past 24 hours, solar wind speed measured by DSCOVR has increased from about 380 to a maximum of about 470 km/s around 17:15 UT on August 1, with current values around 425 km/s. The Interplanetary Magnetic Field (IMF) was mainly oriented towards the Sun, while its magnitude varied between about 1 and 11 nT. Bz varied between about -4 and 9 nT and was mainly positive. A large positive coronal hole extending from the north pole to the equatorial region has been crossing the central meridian from July 31 to August 2. Quiet geomagnetic conditions (K Dourbes between 1 and 2; NOAA Kp between 1 and 3) were registered in the past 24 hours. Active levels (K Dourbes = 4) are possible on August 2, with a slight chance for minor storm conditions (K Dourbes = 5). Quiet to unsettled solar wind conditions (K Dourbes < 4) are expected on August 3. Active to minor storm conditions (K Dourbes = 4 to 5) are possible on August 4, with the expected arrival of a high speed stream from the aforementioned positive coronal hole.

Today's estimated international sunspot number (ISN): 012, based on 15 stations.

Solar indices for 01 Aug 2017

Wolf number Catania	012
10cm solar flux	074
AK Chambon La Forêt	008
AK Wingst	006
Estimated Ap	005
Estimated international sunspot number	012 - Based on 24 stations

Noticeable events summary

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

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