Viewing archive of Saturday, 20 August 2016

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2016 Aug 20 1337 UTC

SIDC Forecast

Solar flares

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

Geomagnetism

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

Solar protons

Quiet

	10cm flux	Ap
20 Aug 2016	081	005
21 Aug 2016	079	005
22 Aug 2016	077	012

Bulletin

Solar activity was very low in the past 24 hours. A B4.4 flare was observed today 20-Aug-2016 coming from the active region AR NOAA 2578 (peaking at 06:00 UT). Two additional active regions are presently observed on the visible side of the solar disc. Their photospheric magnetic field configuration is simple (alpha configuration). There is a transequatorial coronal hole observed presently on the visible solar disc which may become geoeffective in 3-4 days. No Earth-directed CME has been observed. Solar proton flux intensity is expected to lie within the background levels. Solar activity is expected to be low with small probability for B-class flares. The variations of the solar wind parameters were weak. Solar wind speed remained below 400 km/s during the last 24 hours. The magnitude of the Interplanetary Magnetic Field (Bt) elevated till 8 nT this morning (20-Aug-2016) and then it smoothly decreased till 5 nT. The Bz component demonstrated one variation within the interval 7nT : -4 nT and afterwards remained neutral. Geomagnetic conditions have been very quiet in the past 24 hours (K Dourbes between 1 and 3; NOAA Kp between 1 and 2). Geomagnetic activity is expected to continue at very low levels today (20-08-2016) and tomorrow (21-08-2016). Active to minor geomagnetic storm conditions (K Dourbes = 3-4) are possible later as a possible response to the transequatorial negative polarity coronal hole.

Today's estimated international sunspot number (ISN): 019, based on 16 stations.

Solar indices for 19 Aug 2016

Wolf number Catania	///
10cm solar flux	081
AK Chambon La Forêt	012
AK Wingst	006
Estimated Ap	005
Estimated international sunspot number	050 - Based on 23 stations

Noticeable events summary

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

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