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Daily bulletin on solar and geomagnetic activity from the SIDC

Существующий: 2016 Aug 22 1230 UTC

SIDC Forecast

Солнечные вспышки

Quiet conditions (<50% probability of C-class flares)

Geomagnetism

Quiet (A<20 and K<4)

Солнечные протоны

Quiet

	10cm flux	Ap
22 Aug 2016	078	007
23 Aug 2016	080	008
24 Aug 2016	082	022

Bulletin

Solar activity was very low with the X-ray flux remaining below C level. The two regions on disk are the simple NOAA region 2578 and an additional (yet unnumbered) returning region which is rotating onto the Eastern hemisphere. Both remained quiet. Quiet conditions are expected to continue with only a very small chance for C flaring. The proton fluxes are at background levels and expected to remain so. No significant CME's have been identified in coronagraph images.

Solar wind conditions saw the total magnetic field reaching a maximum close to 15nT just after noon August 21 with also a gradual rise of the solar wind speed from around 325 to around 400 km/s. Bz was variable with a maximum southward deflection of -9nT. Meanwhile solar wind speed as well as magnetic field have declined to nominal values and are expected to remain so before later on August 24 the influence of the negative polarity coronal hole in the southern hemisphere may enhance solar wind conditions.

Geomagnetic conditions shortly reached active levels (both local K Dourbes and NOAA Kp 4) in the afternoon of August 21 but are currently back at quiet to unsettled levels. Geomagnetic conditions are expected to remain quiet to unsettled with from August 24 onwards, possibly active conditions under a high speed stream influence.

Today's estimated international sunspot number (ISN): 025, based on 20 stations.

Solar indices for 21 Aug 2016

Wolf number Catania	///
10cm solar flux	077
AK Chambon La Forêt	016
AK Wingst	011
Estimated Ap	010
Estimated international sunspot number	009 - Based on 27 stations

Noticeable events summary

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

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