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Daily bulletin on solar and geomagnetic activity from the SIDC

Emesso: 2025 Nov 19 1231 UTC

SIDC Forecast

Brillamenti solari

C-class flares expected, (probability >=50%)

Geomagnetism

Quiet (A<20 and K<4)

Protoni solari

Quiet

	10cm flux	Ap
19 Nov 2025	132	008
20 Nov 2025	132	011
21 Nov 2025	132	010

Solar Active Regions and flaring

Solar flaring activity was low over the past 24 hours, with only C-class flares identified. A total of 6 numbered sunspot groups were identified on the disk over the past 24 hours. SIDC Sunspot Group 693 (NOAA Active Region 4284) (Beta magnetic configuration) was the most active region over the past 24 hours, but only producing C-class flaring. The largest flare was a C9.9 flare (SIDC Flare 6135) peaking on November 19 at 09:53 UTC was from behind the east limb. Solar flaring activity is expected to be low over the next 24 hours, with C-class flares very likely and a small chance for M-class flares.

Espulsioni di massa coronale

No new Earth-directed Coronal Mass Ejections (CMEs) have been detected in the available coronagraph images.

Fori coronali

SIDC Coronal Hole 137 (mid-latitude coronal hole with a negative polarity) has finished it’s crossing of the central meridian. The influence of the associated high speed stream is expected to impact Earth during Nov 21 2025.

Vento solare

Slow solar wind conditions were recorded over the past 24 hours. The interplanetary magnetic field was around 8 nT, with the Bz reaching a minimum value of +1nT. The solar wind velocity were around 400 km/s. Solar wind conditions may become slightly enhanced in the next 24 hours, in case of the arrival of the High speed stream associated with the SIDC coronal hole 136.

Geomagnetism

Geomagnetic activity was globally and locally quiet to unsettled over the past 24 hours. Geomagnetic conditions are expected to remain quiet to unsettled in the next 24h.

Proton flux levels

The greater than 10 MeV proton flux remained below the 10 pfu threshold and is expected to remain so over the next days.

Electron fluxes at geostationary orbit

The greater than 2 MeV electron flux measured by GOES 18 and GOES 19 remained below the 1000 pfu threshold. Electron flux levels are expected to remain below the 1000 pfu threshold over the next 24 hours. The 24-hour electron fluence remains at normal levels and is expected to remain at normal levels over the next 24 hours.

Today's estimated international sunspot number (ISN): 060, based on 07 stations.

Solar indices for 18 Nov 2025

Wolf number Catania	///
10cm solar flux	120
AK Chambon La Forêt	005
AK Wingst	005
Estimated Ap	004
Estimated international sunspot number	066 - Based on 16 stations

Noticeable events summary

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

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