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Daily bulletin on solar and geomagnetic activity from the SIDC

Emesso: 2016 Aug 17 1253 UTC

SIDC Forecast

Brillamenti solari

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

Geomagnetism

Active conditions expected (A>=20 or K=4)

Protoni solari

Quiet

	10cm flux	Ap
17 Aug 2016	085	008
18 Aug 2016	083	014
19 Aug 2016	081	007

Bulletin

Solar activity is very low. No C flares or CMEs were observed. Five active regions are presently observed on the visible side of the solar disc. Their photospheric magnetic field configuration is simple (beta and alpha configuration). The low latitude coronal hole reached central meridian around 00:00 UT today (17-Aug-2016). Solar proton flux intensity is expected to lie within the background levels. No large flares expected (although C-class flares are possible).

The solar wind speed measured by DSCOVR is slowly increasing and it presently amounts about 420 km/s, probably due to the arrival of the fast solar wind from the low latitude coronal hole, which reached central meridian yesterday afternoon. The magnitude of the Interplanetary Magnetic Field (Bt) first was around 5 nT until it started fluctuating between about 5 and 12 nT since 19:00 UT yesterday (16-Aug-2016). In the past 24 hours, geomagnetic conditions have been quiet (K Dourbes between 1 and 3; NOAA Kp between 1 and 3). Active to minor geomagnetic storm conditions (K Dourbes = 3-4) are possible from tomorrow (18-Aug-2016) due to the expected arrival of a high speed stream associated with a negative coronal hole. A return to quiet to unsettled geomagnetic conditions is expected 19-Aug-2016.

Today's estimated international sunspot number (ISN): 058, based on 25 stations.

Solar indices for 16 Aug 2016

Wolf number Catania	///
10cm solar flux	087
AK Chambon La Forêt	015
AK Wingst	006
Estimated Ap	007
Estimated international sunspot number	081 - Based on 35 stations

Noticeable events summary

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

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