Viewing archive of Thursday, 25 June 2026

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2026 Jun 25 1231 UTC

SIDC Forecast

Solar flares

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

Geomagnetism

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

Solar protons

Quiet

	10cm flux	Ap
25 Jun 2026	141	040
26 Jun 2026	140	028
27 Jun 2026	138	024

Solar Active Regions and flaring

Solar flaring activity was low over the past 24 hours, with only C-class flares. The largest flare was a C4.3 flare (SIDC Flare 8016) peaking on June 25 at 00:22 UTC, which was produced by SIDC Sunspot Group 902 (NOAA Active Region 4478). A total of 8 numbered sunspot groups were identified on the disk over the past 24 hours. SIDC Sunspot Group 899 (NOAA Active Region 4475) has the most complex magnetic configuration (Beta-Gamma). SIDC Sunspot Group 899 (NOAA Active Region 4475) and SIDC Sunspot Group 902 (NOAA Active Region 4478) are in charge of the majority of the flaring activity of the past 24 hours. Solar flaring activity is expected to be low over the next 24 hours, with C-class flares very likely and a chance for M-class flares.

Coronal mass ejections

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

Coronal holes

The northern mid latitude negative polarity SIDC Coronal Hole 142 just finished crossing central meridian.

Solar wind

The solar wind parameters became slightly disturbed, following the arrival of the high speed stream. The solar wind speed around 700 km/s and an interplanetary magnetic field of 7nT, and BZ reaching a maximum negative value of -9nT. Similar conditions can be expected for the next 24 hours.

Geomagnetism

Geomagnetic conditions active to minor storm levels globally and unsettled to active at local levels (Kp up to 5, K_Dourbes up to 4). Active to minor storm conditions can be expected for the next 24 hours, under the continued influence of high speed stream.

Proton flux levels

The greater than 10 MeV proton flux, as measured by GOES-18, was below the 10 pfu 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 remained below the 1000 pfu alert threshold, and is expected to remain below the threshold during the next 24 hours. The 24h electron fluence was at normal levels and is expected to remain so.

Today's estimated international sunspot number (ISN): 094, based on 22 stations.

Solar indices for 24 Jun 2026

Wolf number Catania	144
10cm solar flux	137
AK Chambon La Forêt	033
AK Wingst	020
Estimated Ap	020
Estimated international sunspot number	098 - Based on 31 stations

Noticeable events summary

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

All times in UTC

<< Go to daily overview page