Viewing archive of Monday, 29 June 2026

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2026 Jun 29 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
29 Jun 2026	198	007
30 Jun 2026	186	007
01 Jul 2026	183	007

Solar Active Regions and flaring

Solar flaring activity was low over the past 24 hours, with only C-class flares identified. A total of 6 numbered sunspot groups were identified on the visible solar disk over the past 24 hours. The largest flare was a C9.5 flare (SIDC Flare 8044), peaking on June 28 at 21:44 UTC, and produced by SIDC Sunspot Group 899 (NOAA Active Region 4475). This SIDC Sunspot Group 899 has a Beta-gamma-delta magnetic configuration and was decreasing over the past 24 hours. It produced several C-class flares, including the largest flare of the period, and remained one of the main flaring regions on the disk. SIDC Sunspot Group 860 (NOAA Active Region 4479) and SIDC Sunspot Group 886 (NOAA Active Region 4478) have also Beta-gamma-delta magnetic configuration, and are producing multiple C-class flares up to C8.7. The Beta-gamma-delta regions (SIDC Sunspot Groups 860, 886 and 899) remain the most complex regions on the disk and were responsible for most of the C-class flaring activity. Solar flaring activity is expected to be low to moderate over the next 24 hours, with M-class flares very likely and a small chance for X-class flares.

Coronal mass ejections

No Earth-directed coronal mass ejections were detected in the available coronagraph imagery over the past 24 hours.

Solar wind

Solar wind conditions near Earth reflected slow solar wind conditions over the past 24 hours. The solar wind speed gradually decreased from around 450 km/s to around 370 km/s. The interplanetary magnetic field was weak, with the total magnetic field ranging between 2 and 4 nT and Bz varying between -3 and +2 nT. No prolonged southward Bz interval was observed. Slow solar wind conditions are expected to continue over the next 24 hours.

Geomagnetism

Geomagnetic conditions were quiet globally, with NOAA Kp remaining at quiet levels, and quiet to unsettled locally, with K BEL reaching 3. Mostly quiet to unsettled geomagnetic conditions are expected over the next 24 hours.

Proton flux levels

The greater than 10 MeV proton flux, as measured by GOES, remained at background levels over the past 24 hours and is expected to remain at background levels over the next 24 hours.

Electron fluxes at geostationary orbit

The greater than 2 MeV electron flux, as measured by GOES, was at moderate levels over the past 24 hours. This moderate enhancement is likely associated with the high-speed stream from the coronal hole that affected near-Earth solar wind conditions over the past days. The electron flux is expected to remain at moderate levels over the next 24 hours. The 24h electron fluence was also at moderate levels and is expected to remain so over the next 24 hours.

Today's estimated international sunspot number (ISN): 150, based on 17 stations.

Solar indices for 28 Jun 2026

Wolf number Catania	///
10cm solar flux	186
AK Chambon La Forêt	007
AK Wingst	006
Estimated Ap	004
Estimated international sunspot number	149 - 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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