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Daily bulletin on solar and geomagnetic activity from the SIDC

Vydáno: 2020 Oct 24 1251 UTC

SIDC Forecast

Sluneční erupce

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

Geomagnetism

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

Sluneční protony

Quiet

	10cm flux	Ap
24 Oct 2020	072	028
25 Oct 2020	073	019
26 Oct 2020	074	021

Bulletin

Solar flaring activity was at very low levels. No significant flares have been recorded. Solar activity is expected to remain at very low levels.

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 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 moderate levels as a response to the high solar wind speed caused by the High Speed Streams (HSS) originating from the Coronal Hole (CH) crossing Central Meridian (CM) on Oct 19. It is expected to increase further in the 24 hours.

The speed of the solar wind increased at about Oct 23 17:00UT as a response to the arrival of the HSS originating from the CH crossing CM on Oct 19. Values were between 370 and 575 km/s (DSCOVR). The polarity of the Interplanetary Magnetic Field was predominantly away from the Sun (phi angle to positive sector). Bz fluctuated between -11 and +13 nT. The magnitude of the magnetic field varied between 4 and 15 nT. Over the next 24 hours, the solar wind parameters are expected to remain enhanced due to possible impacts of high speed stream from the CHs crossing the solar disk the past days.

The geomagnetic conditions were active (K Dourbes=4). The values registered for the past 24 hours were 1-4 for K Dourbes and 2-4 for NOAA Kp. Unsettled to active conditions, with a possibility of a minor storm are expected for the next 24 hours.

Today's estimated international sunspot number (ISN): 016, based on 15 stations.

Solar indices for 23 Oct 2020

Wolf number Catania	026
10cm solar flux	072
AK Chambon La Forêt	034
AK Wingst	016
Estimated Ap	017
Estimated international sunspot number	017 - Based on 27 stations

Noticeable events summary

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

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