Viewing archive of Thursday, 19 June 2025

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2025 Jun 19 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
19 Jun 2025	137	014
20 Jun 2025	139	014
21 Jun 2025	141	011

Solar Active Regions and flaring

Solar flaring activity was at low levels over the past 24 hours. A total of 8 numbered sunspot groups were identified on the visible solar disk. The strongest activity was a C7.9 flare (SIDC Flare 4701), peak time 09:17 UTC on June 19. The flare was produced by SIDC Sunspot Group 523 (NOAA Active Region 4114), which remains the most complex region on disk, classified as magnetic type beta-gamma- delta. SIDC Sunspot Group 526 (NOAA Active Region 4117) which recently rotated from over the east limb is now classified as magnetic type beta- gamma. These two regions are responsible for most of the flaring activity over the past 24 hours. The remaining active regions on the visible disk have been simple and/or quiet. Solar flaring activity is expected to be at moderate levels over the next 24 hours with likely M-class flares.

Coronal mass ejections

No Earth-directed coronal mass ejections (CMEs) have been identified in the available coronagraph imagery over the past 24 hours.

Coronal holes

A large positive polarity coronal hole (SIDC Coronal Hole 104) continues to reside on the central meridian. This is a mid-latitude southern coronal hole covering a large longitudinal range which first crossed the central meridian on June 11. A mild high speed stream emanating from it is expected to continue influencing the Earth over the next days.

Solar wind

Over the past 24 hours the solar wind parameters (ACE and DSCOVR) were under the continuous influence of a high speed stream from a large positive polarity coronal hole, part of which still resides on the central meridian. The interplanetary magnetic field (B) was enhanced with a maximum value of 10.7 nT and a minimum Bz of -8 nT. The solar wind speed reached up to 600 km/s. The B field phi angle was predominantly in the positive sector (directed away from the Sun). The solar wind conditions are expected to continue to be under the influence of a high speed stream over the next days.

Geomagnetism

The geomagnetic conditions over the past 24 hours were quiet to active. Quiet to active geomagnetic conditions are expected for the next 24 hours.

Proton flux levels

Over the past 24 hours the greater than 10 MeV GOES proton flux has been at nominal levels and is expected to remain at nominal levels over the next days.

Electron fluxes at geostationary orbit

The greater than 10 MeV GOES 18 electron flux briefly exceeded the 1000 pfu threshold over the last 24 hours and is expected to exceed the threshold again over the next 24 hours. The 24-hour electron fluence was at the nominal levels and is expected to be at the border of nominal to moderate levels in the next 24 hours.

Today's estimated international sunspot number (ISN): 132, based on 21 stations.

Solar indices for 18 Jun 2025

Wolf number Catania	128
10cm solar flux	137
AK Chambon La Forêt	022
AK Wingst	018
Estimated Ap	018
Estimated international sunspot number	131 - Based on 32 stations

Noticeable events summary

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

All times in UTC

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