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Daily bulletin on solar and geomagnetic activity from the SIDC

Emesso: 2017 Sep 19 1231 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
19 Sep 2017	072	005
20 Sep 2017	073	006
21 Sep 2017	076	006

Bulletin

Over the past 24 hours the solar activity was very low with no flaring activity recorded. The Catania sunspot group 55 (NOAA active region 2680) is the only present region on the disc, and is unlikely to produce any flaring activity. We expect the solar activity to remain quiet until the returning region (Catania sunspot group 49 / NOAA active region 2676) will come from behind the East solar limb by the end of the day.

No Earth directed CMEs have been observed and the solar protons remained at background level in the past 24 hours.

Solar wind speed starts a slow overall decline from about 700 km/s to 500 km/s. The interplanetary magnetic field magnitude returned to its nominal 3-6 nT range with the Bz component fluctuating between -4 and 4 nT. The solar wind is expected to further recover to nominal conditions over the next days.

Geomagnetic conditions were quiet to active (local K Dourbes 1-4, NOAA Kp 1-3) and are expected to remain quiet to unsettled over the next days.

Today's estimated international sunspot number (ISN): 012, based on 21 stations.

Solar indices for 18 Sep 2017

Wolf number Catania	013
10cm solar flux	072
AK Chambon La Forêt	026
AK Wingst	021
Estimated Ap	027
Estimated international sunspot number	014 - Based on 35 stations

Noticeable events summary

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

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