Viewing archive of Sunday, 25 January 2026

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2026 Jan 25 1232 UTC

SIDC Forecast

Solar flares

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

Geomagnetism

Quiet (A<20 and K<4)

Solar protons

Quiet

	10cm flux	Ap
25 Jan 2026	173	007
26 Jan 2026	173	007
27 Jan 2026	173	014

Solar Active Regions and flaring

Solar flaring activity was low over the past 24 hours, with only a few weak C-class flares observed. A total of 9 numbered sunspot groups were identified on the disk. The largest flare was a C6.3 flare (SIDC Flare 6733) peaking on January 25 at 10:30 UTC, which was produced by SIDC Sunspot Group 768 (NOAA Active Region 4351). Solar flaring activity is expected to be low over the next 24 hours, with C-class flares very likely and a chance of M-class flares.

Coronal mass ejections

No Earth-directed coronal mass ejection (CME) were observed in SOHO/LASCO images over the past 24 hours.

Coronal holes

An newly emerged equatorial coronal hole (SIDC Coronal Hole 147, negative polarity) is currently facing Earth.

Solar wind

Over the past 24 hours, solar wind conditions remained moderately elevated and stable. Solar wind speed ranged from about 450 km/s to about 645 km/s and stayed mostly near 500 to 600 km/s. The interplanetary magnetic field (IMF) remained low to moderate, with Bt between about 4 and 8 nT, while the north south component Bz fluctuated between about -6 nT and +6 nT, without prolonged intervals of strongly southward Bz. Overall, these signatures indicate a continued recovery toward more typical solar wind conditions, although the flow remains somewhat enhanced. The equatorial coronal hole (SIDC Coronal Hole 147, negative polarity) is currently facing Earth, and is expected to enhanced solar wind speeds near Earth in about 2 to 3 days.

Geomagnetism

Geomagnetic activity was mostly unsettled to active. Globally, NOAA Kp stayed mainly around Kp 3, with a brief period reaching Kp 4 during the evening of January 24, and then returned to unsettled levels. Over Belgium, K_BEL remained mostly low, around 2 to 3, with a short interval of active conditions (K_BEL near 4) from late evening into early night. Further unsettled to active intervals remain possible if Bz turns southward for extended periods, but the overall trend remains quieting.

Proton flux levels

The solar energetic particle event associated with the X1.9 flare (SIDC Flare 6678, peaking on 2026 Jan 18 at 18:09 UTC) remained ongoing until 2026 Jan 22 at 08:35 UTC, when the greater than 10 MeV GOES proton flux dropped below the 10 pfu threshold. The greater than 10 MeV flux is expected to continue to decay toward background levels. A new solar energetic particle event is not very likely but cannot be fully excluded given the number of sunspot groups currently on the visible disk, in particular the most magnetically complex regions.

Electron fluxes at geostationary orbit

The greater than 2 MeV GOES electron flux stayed above to the 1000 pfu alert threshold over the past 24 hours. In response of the elevated solar wind speed in the past 4-5 days, the greater than 2 MeV electron flux may remain near or above the threshold during the next 24 hours. The 24-hour electron fluence remained at moderate levels and is expected to stay around these levels, with a possible increase if elevated electron flux persists.

Today's estimated international sunspot number (ISN): 144, based on 07 stations.

Solar indices for 24 Jan 2026

Wolf number Catania	///
10cm solar flux	174
AK Chambon La Forêt	026
AK Wingst	019
Estimated Ap	020
Estimated international sunspot number	160 - Based on 16 stations

Noticeable events summary

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

All times in UTC

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