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Daily bulletin on solar and geomagnetic activity from the SIDC

Emesso: 2025 Feb 17 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
17 Feb 2025	185	007
18 Feb 2025	187	007
19 Feb 2025	189	007

Solar Active Regions and flaring

A total of 12 numbered sunspot groups were identified on the disk over the past 24 hours. Solar activity has been low int he last 24 hours, only C-class flaring was observed. The largest flare was a C6.1 flare (SIDC Flare 3629) peaking on February 16 at 18:38 UTC, which was produced by SIDC Sunspot Group 408 (NOAA Active Region 3998). Solar flaring activity is expected to be low over the next 24 hours, with C-class flares expected and a chance for M-class flares.

Espulsioni di massa coronale

No Earth directed CMEs were observed in the last 24 hours.

Fori coronali

SIDC Coronal Hole 91 (high-latitude coronal hole with a positive polarity) first reached the central meridian on February 16 and is now positioned on the western side of the Sun. This CH is located at high northern latitudes, so its solar wind will probably not affect the Earth.

Vento solare

The solar wind parameters at the Earth shows that the high speed stream is passing, and the solar wind is returning to slow solar wind conditions. Current solar wind speed is at 500 km/s with an interplanetary magnetic field around 5 nT. A gradual transition to slow solar wind conditions is expected for the next 24 hours.

Geomagnetism

Geomagnetic conditions reached active levels with Kp up to 4 between 21:00 UTC on 16 February and 00:00 UTC the next day. Mostly quiet to unsettled conditions can be expected or the next 24 hours.

Proton flux levels

The greater than 10 MeV proton flux was below the threshold level over the past 24 hours. It is expected to remain below the threshold level over the next 24 hours.

Electron fluxes at geostationary orbit

The greater-than-10 MeV GOES 16 and 18 proton flux has been above the threshold in the last 24 hours, but it is currently below it. It is expected to rise above the threshold in the next 24 hours. The 24-hour electron fluence is currently at normal levels and is expected to remain so in the next 24 hours.

Today's estimated international sunspot number (ISN): 189, based on 14 stations.

Solar indices for 16 Feb 2025

Wolf number Catania	///
10cm solar flux	185
AK Chambon La Forêt	029
AK Wingst	022
Estimated Ap	022
Estimated international sunspot number	185 - Based on 16 stations

Noticeable events summary

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

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