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Daily bulletin on solar and geomagnetic activity from the SIDC

Emesso: 2020 Sep 22 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
22 Sep 2020	071	005
23 Sep 2020	073	007
24 Sep 2020	075	013

Bulletin

The Sun is still spotless, as the active region rotating into view over the east limb has shown no sunspots. It produced numerous B-class flares over the past 24 hours, with the largest being a B4.3 flare peaking at 12:42 UT on September 21. More B-flares can be expected, there are minor chances of having C-class flares.

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

The greater than 10 MeV proton flux was at nominal levels in the past 24 hours, and is expected to stay at nominal levels in the next 24 hours. The greater than 2 MeV electron flux was at nominal levels in the past 24 hours, and is expected to stay at nominal levels in the next 24 hours.

Solar wind speed near Earth as registered by DSCOVR varied between about 300 and 350 km/s in the past 24 hours. The Interplanetary Magnetic Field (IMF) was oriented towards the Sun (negative) with a magnitude between 3 nT and 9 nT. Bz reached -6 nT.

Quiet to unsettled geomagnetic conditions (K Dourbes between 0 and 3; NOAA Kp between 0 and 3) were registered in the past 24 hours. Quiet to unsettled geomagnetic levels (K Dourbes < 4) are expected for the next 48 hours. The solar wind coming from the low latitude extension of the northern polar coronal hole may affect the Earth in about 48 hours, that could lead to an increase in geomagnetic levels.

Today's estimated international sunspot number (ISN): 000, based on 21 stations.

Solar indices for 21 Sep 2020

Wolf number Catania	000
10cm solar flux	071
AK Chambon La Forêt	009
AK Wingst	003
Estimated Ap	002
Estimated international sunspot number	000 - Based on 35 stations

Noticeable events summary

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

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