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Daily bulletin on solar and geomagnetic activity from the SIDC

Emesso: 2025 Jun 24 1234 UTC

SIDC Forecast

Brillamenti solari

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

Geomagnetism

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

Protoni solari

Quiet

	10cm flux	Ap
24 Jun 2025	121	013
25 Jun 2025	121	040
26 Jun 2025	120	037

Solar Active Regions and flaring

Solar flaring activity was low over the past 24 hours, with only C-class flares identified. The largest flare was a C5.0 flare (SIDC Flare 4739) peaking at 12:23 UTC on June 23, which was produced by SIDC Sunspot Group 523 (NOAA Active Region 4114). A total of 6 numbered sunspot groups were identified on the disk over the past 24 hours. SIDC Sunspot Group 527 (NOAA Active Region 4118) is the complex region with its beta-gamma magnetic configurations. The solar flaring activity is expected to be at low to moderate levels over the next 24 hours with C-class flares expected, M-class flares probable, and a small chance of X-class flares.

Espulsioni di massa coronale

No Earth-directed coronal mass ejections (CME) were detected in the available coronagraph observations during last 24 hours.

Fori coronali

SIDC Coronal Hole 116 (negative polarity), which spans from 20 S to 30 N, is still crossing the central meridian. The high speed stream from this coronal hole are expected to enhance the solar wind environment near Earth on Jun 24-25.

Vento solare

Solar wind parameters are transitioning to slow solar wind regime. The solar wind speed ranged between 385 km/s and 480 km/s. The North-South component (Bz) ranged between -5 and 5 nT. The interplanetary magnetic field ranged from 1 nT to 7 nT. Enhanced solar wind parameters are expected in the next 24 hours with the arrival of high speed streams from the SIDC Coronal Hole 116 (negative polarity) which started to cross the central meridian on Jun 21.

Geomagnetism

Geomagnetic conditions were globally at quiet (NOAA Kp 1 to 2), and locally at quiet to unsettled conditions (K_BEL 1 to 3) during the past 24 hours. We expect unsettled to minor storm conditions (K 3 to 5) in the next 24 hours with the arrival of high speed streams from the SIDC Coronal Hole 116 (negative polarity) which started to cross the central meridian on Jun 21.

Proton flux levels

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

Electron fluxes at geostationary orbit

The greater than 2 MeV electron flux, as measured by GOES-19, mostly remained below the threshold level, except from 14:00 UTC to 18:15 UTC on Jun 23, when it fluctuated around the threshold level. The greater than 2 MeV electron flux, as measured by GOES-18 satellite, reached above the threshold level at 16:00 UTC on Jun 23 and dropped below it at 02:45 UTC on Jun 24. In the next 24 hours, the electron flux is expected to remain below the threshold level, but increasing above the threshold level cannot be excluded. The 24h electron fluence is presently at normal level, and it is expected to remain so in the next 24 hours.

Today's estimated international sunspot number (ISN): 081, based on 19 stations.

Solar indices for 23 Jun 2025

Wolf number Catania	143
10cm solar flux	122
AK Chambon La Forêt	010
AK Wingst	009
Estimated Ap	008
Estimated international sunspot number	086 - Based on 30 stations

Noticeable events summary

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

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