Viewing archive of Saturday, 27 June 2026

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2026 Jun 27 1231 UTC

SIDC Forecast

Solar flares

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

Geomagnetism

Quiet (A<20 and K<4)

Solar protons

Quiet

	10cm flux	Ap
27 Jun 2026	163	008
28 Jun 2026	158	007
29 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 C5.7 flare (SIDC Flare 8024) peaking on June 26 at 12:48 UTC, which was produced by SIDC Sunspot Group 886 (NOAA Active Region 4478). A total of 6 numbered sunspot groups were identified on the disk over the past 24 hours. Currently the most complex active regions are SIDC Sunspot Group 886 (NOAA Active Region 4478) with a Beta-Gamma-Delta magnetic configuration and SIDC Sunspot Group 899 (NOAA Active Region 4475) with a Beta-Gamma magnetic configuration. These regions were in charge of the majority of the flaring activity of the past 24 hours. Solar flaring activity is expected to be moderate over the next 24 hours, with M-class flares very likely and a small chance for X-class flares.

Coronal mass ejections

The CME that was first seen in LASCO C2 from 21:15 UTC June 26 is directed towards the south will be further analysed when more data become available in order to assess for any Earth-directed component. No other Earth-directed CMEs have been observed in available imagery.

Solar wind

Solar wind conditions are transitioning to slow solar wind conditions after the passage of the High Speed Stream. The solar wind speed decreased from 650 to 550 km/s, the magnetic field decreased from 5nT to 3 nT, and the Bz reached a minimum value of -3 nT. Solar wind conditions are expected to continue the transition to slow solar wind conditions in the next 24 hours.

Geomagnetism

Geomagnetic conditions were quiet to unsettled both locally and globally (Kp up to 3, K_Bel up to 3). 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 is above the 1000 pfu alert threshold since June 26 14:30 UTC, and is expected to remain above the threshold during the next 24 hours. The 24h electron fluence has increased to moderate levels and is expected to remain so for the next 24 hours.

Today's estimated international sunspot number (ISN): 126, based on 16 stations.

Solar indices for 26 Jun 2026

Wolf number Catania	175
10cm solar flux	163
AK Chambon La Forêt	018
AK Wingst	014
Estimated Ap	014
Estimated international sunspot number	114 - Based on 28 stations

Noticeable events summary

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

All times in UTC

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