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Daily bulletin on solar and geomagnetic activity from the SIDC

Emesso: 2020 Oct 19 1250 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 Oct 2020	076	007
20 Oct 2020	075	006
21 Oct 2020	074	016

Bulletin

Solar flaring activity is low. Presently there two active regions observed on the visible side of the solar disc. Catania group 45 (NOAA AR 2776 - beta classification - SE) was the source of nine B and four A-class flares in the last 24 hours. NOAA AR 2777 (beta classification - SW) was the source of three B and two A-class flares in the last 24 hours. NOAA AR 2776 could be the source more low B-class flares and possibly, but not very probably also isolated C-class flares in the coming hours. NOAA AR 2777 is about to rotate to none visible part of the solar disk.

The Coronal Mass Ejections (CMEs) observed in the available coronagraphic imagery are not expected to impact Earth.

The greater than 10 MeV proton flux was at background levels over the past 24 hours. It is expected to stay at background levels for the next 24 hours. The greater than 2 MeV electron flux was at nominal levels over the past 24 hours and is expected to remain so over the next 24 hours.

The speed of the solar wind varied between 305 and 380 km/s (DSCOVR). The polarity of the Interplanetary Magnetic Field (IMF) was predominantly towards the Sun (phi angle in the negative sector) until late Oct 18th, when it switched to the positive sector. Bz fluctuated between -5 and +6 nT. The magnitude of the magnetic field varied between 2 and 7 nT. Over the next 24 hours, the solar wind parameters are expected to be remain at about these levels.

The geomagnetic conditions were quiet to unsettled. The values registered for the past 24 hours were 0-3 for K Dourbes and 0-2 for NOAA Kp. Quiet to unsettled conditions are expected for the next 24 hours.

Today's estimated international sunspot number (ISN): 014, based on 19 stations.

Solar indices for 18 Oct 2020

Wolf number Catania	///
10cm solar flux	076
AK Chambon La Forêt	005
AK Wingst	002
Estimated Ap	002
Estimated international sunspot number	018 - Based on 17 stations

Noticeable events summary

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

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