Viewing archive of Sunday, 27 September 2020

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2020 Sep 27 1231 UTC

SIDC Forecast

Solar flares

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

Geomagnetism

Minor storm expected (A>=30 or K=5)

Solar protons

Quiet

	10cm flux	Ap
27 Sep 2020	073	027
28 Sep 2020	073	013
29 Sep 2020	072	029

Bulletin

NOAA AR 2773 has lost its sunspot, the Sun is spotless. No flares in the past 24 hours, none expected above the B level.

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 so in the next 24 hours. The greater than 2 MeV electron has passed the 10^3 pfu threshold at 03:00 UT, it was also above the threshold five hours starting at 13:30 on 26 September.

Geomagnetic conditions have reached minor storm conditions at planetary levels (Kp = 5) and active conditions locally (KDourbes = 4, but the latest data are missing). The Earth is still inside the fast solar wind from the low latitudinal extension of the northern polar coronal hole. Its influence is fading, mostly unsettled conditions expected for the next 24 hours. In about 48 hours the fast solar wind emanating from a low latitude large area coronal hole (still connected to the northern polar one) will affect the Earth and may cause up to major storm conditions.

Today's estimated international sunspot number (ISN): 000, based on 13 stations.

Solar indices for 26 Sep 2020

Wolf number Catania	///
10cm solar flux	073
AK Chambon La Forêt	029
AK Wingst	025
Estimated Ap	026
Estimated international sunspot number	000 - Based on 27 stations

Noticeable events summary

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

All times in UTC

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