Viewing archive of Friday, 19 June 2026

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2026 Jun 19 1231 UTC

SIDC Forecast

Solar flares

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

Geomagnetism

Quiet (A<20 and K<4)

Solar protons

Quiet

	10cm flux	Ap
19 Jun 2026	111	013
20 Jun 2026	111	007
21 Jun 2026	111	007

Solar Active Regions and flaring

A total of 3 numbered sunspot groups were identified on the disk over the past 24 hours. Solar activity is low, with only minor C-class flaring happening. The largest flare was a C1.2 flare on 18 June 22:04 UTC, from an active region rotating into view over the east limb. Low activity with C-class flaring is expected for the next 24 hours.

Coronal mass ejections

No Earth-directed CMEs were observed in the last 24 hours.

Coronal holes

SIDC coronal hole 169 (equatorial coronal hole, positive polarity) is on the western hemisphere.

Solar wind

The Earth is inside slow solar wind, the solar wind speed decreased to 360 km/s and the interplanetary magnetic field is around 8 nT. Today, we may see the arrival of a mild high speed stream, from SIDC Coronal Hole 169.

Geomagnetism

Geomagnetic conditions were quiet to unsettled both at planetary and local levels (Kp and K_Bel up to 3). The possible arrival of a mild high speed stream may increase geomagnetic levels.

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): 064, based on 22 stations.

Solar indices for 18 Jun 2026

Wolf number Catania	051
10cm solar flux	111
AK Chambon La Forêt	014
AK Wingst	010
Estimated Ap	007
Estimated international sunspot number	057 - 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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