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Daily bulletin on solar and geomagnetic activity from the SIDC

Emesso: 2021 Aug 18 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
18 Aug 2021	073	007
19 Aug 2021	075	007
20 Aug 2021	077	007

Bulletin

One active region is visible on the solar disk: NOAA 2857 (beta magnetic field configuration, located on the northwest), this region has decreased in size and complexity in the past 24 hours. Solar flaring activity was at low levels and is expected to remain so.

No Earth directed Coronal Mass Ejections (CMEs) were observed in the available coronagraphic imagery.

The greater than 10 MeV proton flux was at background levels in the past 24 hours, and is expected to remain so in the next 24 hours. The greater than 2 MeV electron flux remained below the 1000 pfu alert threshold, while the 24h electron fluence was at normal levels over the past 24 hours. Over the next 24 hours they are expected to remain at those levels.

Over the past 24 hours the solar wind speed has been around 450 km/s. The total magnetic field strength was around 4 nT, with positive polarity (directed away from the Sun). Same conditions are expected for the next 24 hours.

Geomagnetic conditions were at quiet to unsettled levels (NOAA Kp 0-3 and K Dourbes 1-3) over the past 24 hours. Similar conditions are expected over the next 24 hours..

Today's estimated international sunspot number (ISN): 011, based on 08 stations.

Solar indices for 17 Aug 2021

Wolf number Catania	013
10cm solar flux	073
AK Chambon La Forêt	012
AK Wingst	006
Estimated Ap	006
Estimated international sunspot number	013 - Based on 20 stations

Noticeable events summary

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

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