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Daily bulletin on solar and geomagnetic activity from the SIDC

Emesso: 2015 Aug 16 1325 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
16 Aug 2015	088	031
17 Aug 2015	086	010
18 Aug 2015	084	010

Bulletin

Solar activity was low with no C-class flares reported. We expect the low solar activity to persist in the coming hours with possible isolated C-class flare. No Earth directed CMEs were observed in the last 24 hours.

The solar wind speed is slowly increasing and it currently amounts to about 550 km/s. The interplanetary magnetic field magnitude is still slightly elevated and currently amounts to about 8 nT. Since arrival of the shock wave and the ICME yesterday morning, the Bz component of the interplanetary magnetic field had long intervals of negative values (down to -10 nT). The strongly negative values of Bz component of the interplanetary magnetic field and the fast solar wind induced geomagnetic storm conditions (NOAA reported Kp=6 and a number of Kp=5 intervals and local stations Dourbes and IZMIRAN reported up to K=5). Currently the Bz component is positive however if the Bz component of the interplanetary magnetic field turns negative we can expect active to unsettled conditions to persist in the coming hours.

Today's estimated international sunspot number (ISN): 036, based on 17 stations.

Solar indices for 15 Aug 2015

Wolf number Catania	///
10cm solar flux	089
AK Chambon La Forêt	055
AK Wingst	029
Estimated Ap	034
Estimated international sunspot number	036 - Based on 22 stations

Noticeable events summary

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

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