Viewing archive of Friday, 20 June 2025

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2025 Jun 20 1233 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
20 Jun 2025	135	011
21 Jun 2025	133	016
22 Jun 2025	130	012

Solar Active Regions and flaring

Solar flaring activity was at high levels over the past 24 hours. A total of 7 numbered sunspot groups were identified on the visible solar disk. The strongest activity was a X1.9 flare (SIDC 4707) produced by SIDC Sunspot Group 523 (NOAA Active Region 4114) with peak time 09:17 UTC on June 19. This region was responsible for most of the flaring activity, including an M4.6 flare (SIDC Flare 4711) peak time 00:04 UTC on June 20. The region has meanwhile decreased its underlying magnetic field complexity and is currently classified as magnetic type beta-gamma. Other notable regions are SIDC Sunspot Group 526 (NOAA Active Region 4117), classified as beta-gamma and SIDC Sunspot Group 527 (NOAA Active Region 4118), classified as magnetic type beta. The solar flaring activity is expected to be at moderate levels over the next 24 hours with expected C-class flares and 55% chances of M-class flaring.

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. 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) remained under the continuous influence of a high speed stream from a large positive-polarity coronal hole, which continues to partly reside on the central meridian. The interplanetary magnetic field (B) was mildly enhanced with a maximum value of 9.7 nT and a minimum Bz of -7.7 nT. The solar wind speed was slowly varying, currently around 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 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 remain so in 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 geomagnetic conditions over the past 24 hours were quiet to active. Quiet to active geomagnetic conditions are expected for the next 24 hours.

Today's estimated international sunspot number (ISN): 112, based on 25 stations.

Solar indices for 19 Jun 2025

Wolf number Catania	104
10cm solar flux	136
AK Chambon La Forêt	019
AK Wingst	012
Estimated Ap	013
Estimated international sunspot number	132 - Based on 25 stations

Noticeable events summary

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

All times in UTC

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