Viewing archive of Saturday, 20 June 2026

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2026 Jun 20 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
20 Jun 2026	111	006
21 Jun 2026	113	007
22 Jun 2026	115	007

Solar Active Regions and flaring

A total of 4 numbered sunspot groups were identified on the disk over the past 24 hours. An M1.3 flare (the largest of the period) was observed peaking on June 20 at 01:51 UTC, which was produced by SIDC Sunspot Group 897 (NOAA Active Region 4472) that rotated into view from the east limb. More M-class flares are possible in the coming 24 hours.

Coronal mass ejections

A wide Coronal Mass Ejection (CME) with an angular width of approximately 90 degrees was detected by LASCO C2 at 02:12 UTC on 20 June. Associated with an M1.3 solar flare, this CME originated near the east limb and is directed eastward; no Earth arrival is expected. Shortly after, at 03:12 UTC, a second CME emerged toward the northeast. While spatial and temporal proximity causes these CMEs to appear merged in coronagraph imagery, they are distinct events. The second CME originated on the farside of the Sun and will not impact Earth.

Solar wind

In the last 24 hours we saw a slight increase in solar wind speed (up to 450 km/s) and magnetic field (11 nT) related to the expected mild fast stream from SIDC Coronal Hole 169. The Earth is currently inside slow solar wind, the solar wind speed is around 400 km/s and the interplanetary magnetic field is at 7nT. Similar conditions can be expected for the next 24 hours.

Geomagnetism

Geomagnetic conditions were quiet to unsettled both at planetary and local levels (Kp and K_Bel up to 3). Similar 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, as measured by GOES-18 and GOES-19 was below the 1000 pfu alert threshold in the past 24 hours. The flux is expected to remain low over the next 24 hours. The 24-hour electron fluence was at normal levels over the past 24 hours and is expected to remain at these levels over the next 24 hours.

Today's estimated international sunspot number (ISN): 089, based on 20 stations.

Solar indices for 19 Jun 2026

Wolf number Catania	053
10cm solar flux	111
AK Chambon La Forêt	013
AK Wingst	008
Estimated Ap	009
Estimated international sunspot number	066 - Based on 29 stations

Noticeable events summary

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

All times in UTC

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