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Daily bulletin on solar and geomagnetic activity from the SIDC

Emesso: 2016 Sep 16 1241 UTC

SIDC Forecast

Brillamenti solari

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

Geomagnetism

Quiet (A<20 and K<4)

Protoni solari

Quiet

	10cm flux	Ap
16 Sep 2016	084	003
17 Sep 2016	083	006
18 Sep 2016	082	013

Bulletin

Over the past 24 hours solar activity has been low. No C-class flares, no earth-directed coronal mass ejections (CME) have been observed. Active Region (AR) NOAA 2592 (Macintosh class:Bxo; Mag. type:Beta) has emerged over the East solar limb and has been most active, producing the B4.1 class flare, which peaked at 04:43 UT yesterday. Another AR 2591 has shown low levels of activity. Solar protons have remained at background levels over the past 24 hours. No Earth directed CMEs were detected. Solar activity is expected to remain low over the next 24 hours with a high chance of B-class flares and a low probability of C-class flares. The variations of the solar wind parameters were weak. Solar wind speed remained below 330 km/s during the last 24 hours. The magnitude of the Interplanetary Magnetic Field (Bt) smoothly elevated from 5 nT till 7 nT yesterday evening (15-Aug-2016). The Bz component remained neutral till 19:30 UT yesterday evening (15 Aug-2016) and then became positive. Geomagnetic conditions have been very quiet in the past 24 hours (K Dourbes between 0 and 2; NOAA Kp between 0 and 1). Geomagnetic activity is expected to continue at low levels today (16-Aug-2016) and tomorrow (17-Aug-2016). Active to minor geomagnetic storm conditions (K Dourbes between 3 and 4) are possible from 18-Aug-2016 as a possible response to the negative polarity coronal hole moving into a potentially geoeffective position.

Today's estimated international sunspot number (ISN): 013, based on 17 stations.

Solar indices for 15 Sep 2016

Wolf number Catania	037
10cm solar flux	084
AK Chambon La Forêt	007
AK Wingst	006
Estimated Ap	007
Estimated international sunspot number	022 - Based on 21 stations

Noticeable events summary

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

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