Viewing archive of Friday, 26 June 2026

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2026 Jun 26 1231 UTC

SIDC Forecast

Solar flares

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

Geomagnetism

Active conditions expected (A>=20 or K=4)

Solar protons

Quiet

	10cm flux	Ap
26 Jun 2026	147	021
27 Jun 2026	150	014
28 Jun 2026	152	007

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 C6.6 flare (SIDC Flare 8020) peaking on June 25 at 15:03 UTC, which was produced by SIDC Sunspot Group 886 (NOAA Active Region 4478). A total of 7 numbered sunspot groups were identified on the disk over the past 24 hours. SIDC Sunspot Group 886 (NOAA Active Region 4478) currently located at S06E59 has a Beta-Gamma-Delta magnetic configuration and was in charge of the majority of the flaring over the past 24 hours. Solar flaring activity is expected to be high over the next 24 hours, with M-class flares very likely and a chance for X-class flares.

Coronal mass ejections

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

Solar wind

Earth continues to be under the influence of high speed streams (HSSs) from the successive coronal holes which crossed the central meridian on June 22 till June 25. The solar wind speed ranged between 650 km/s to 700 km/s.The interplanetary magnetic field was around 6nT, with the Bz reaching a minimum value of -6 nT. Similar solar wind conditions are expected in the next 24 hours.

Geomagnetism

Geomagnetic conditions were unsettled to active both locally and globally (Kp up to 4, K_Bel up to 4). Similar quiet to unsettled conditions can be expected for the next 24 hours.

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 was mainly below the 1000 pfu alert threshold, with a short and minimal crossing of that threshold on June 25 7:25 UTC as reported by GOES 18. Similar short and minimal crossing of the 1000 pfu threshold by the greater than 2 MeV electron flux is expected 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): 114, based on 23 stations.

Solar indices for 25 Jun 2026

Wolf number Catania	163
10cm solar flux	156
AK Chambon La Forêt	031
AK Wingst	025
Estimated Ap	029
Estimated international sunspot number	093 - Based on 33 stations

Noticeable events summary

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

All times in UTC

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