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Daily bulletin on solar and geomagnetic activity from the SIDC

Emesso: 2025 Feb 18 1231 UTC

SIDC Forecast

Brillamenti solari

M-class flares expected (probability >=50%)

Geomagnetism

Quiet (A<20 and K<4)

Protoni solari

Quiet

	10cm flux	Ap
18 Feb 2025	185	007
19 Feb 2025	183	007
20 Feb 2025	181	007

Solar Active Regions and flaring

A total of 12 numbered sunspot groups were identified on the disk over the past 24 hours. Solar flaring activity was moderate over the past 24 hours, with 1 M-class flare identified. The largest flare was a M1.0 flare (SIDC Flare 3633) peaking on February 17 at 15:13 UTC, which was produced by SIDC Sunspot Group 399 (NOAA Active Region 3992). Solar flaring activity is expected to be moderate over the next 24 hours, with C-class flares expected and M-class flares likely.

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) crossed the central meridian on February 16. This CH is located at high northern latitudes, so its solar wind will probably not affect the Earth.

Vento solare

The solar wind speed at Earth has been steady at around 500 km/s in the last 24 hours, with an interplanetary magnetic field around 6 nT. A gradual transition to slower solar wind can be expected in the next 24 hours.

Geomagnetism

Geomagnetic conditions reached active levels with Kp up to 4 between 15:00 UTC to 18:00 UTC on 17 February and between 00:00 UTC and 03:00 UTC on 18 February. Mostly quiet to unsettled conditions can be expected for 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): 153, based on 12 stations.

Solar indices for 17 Feb 2025

Wolf number Catania	257
10cm solar flux	///
AK Chambon La Forêt	028
AK Wingst	017
Estimated Ap	016
Estimated international sunspot number	186 - Based on 22 stations

Noticeable events summary

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

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