Viewing archive of Friday, 30 January 2026

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2026 Jan 30 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
30 Jan 2026	127	008
31 Jan 2026	125	007
01 Feb 2026	123	004

Solar Active Regions and flaring

Solar flaring activity was low over the past 24 hours, with only C-class flares identified. A total of 12 numbered sunspot groups were identified on the visible solar disk over the past 24 hours. All regions are relatively small and remain magnetically simple (classified as magnetic type alpha or beta). The strongest flaring activity was a C1.7 flare (SIDC Flare 6760) with peak time 08:63 UTC on Jan 30, produced by SIDC Sunspot Group 781 (NOAA Active Region 4363) near the east limb. The solar flaring activity is expected to be low over the next 24 hours with very likely C-class flares and small chances for 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.

Solar wind

Over the past 24 hours the solar wind parameters (as measured by ACE at L1) were under a waning influence of a high speed stream related to the negative polarity coronal hole (SIDC Coronal Hole 147). The solar wind speed was gradually decreasing with values varying in the range of 517 km/s to 781 km/s. The magnitude of the interplanetary magnetic field (B) has decreased reaching a maximum value of 6.2 nT with a minimum north-south (Bz) component of - 5.7 nT. The B field phi angle remained predominantly in the negative sector (directed towards the Sun) reflecting the polarity of the geo-effective SIDC Coronal Hole 147. The solar wind parameters are expected to follow a gradual trend towards nominal slow solar wind conditions over the next 24 hours and register nominal values thereafter.

Geomagnetism

The geomagnetic conditions over the past 24 hours have been quiet to active. Predominantly quiet to unsettled geomagnetic conditions are expected for the next 24 hours with chances for isolated active periods under the waning influence of a high speed stream. Mostly quiet conditions are expected thereafter.

Proton flux levels

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

Electron fluxes at geostationary orbit

The greater than 2 MeV electron flux as measured by GOES 18 and GOES 19 was exceeding the 1000 pfu threshold over the past 24 hours. The greater than 2 MeV electron flux is expected to remain above the 1000 pfu threshold for prolonged periods of time over the next 24 hours. The 24-hour electron fluence was at moderate levels and is expected to increase towards the border of moderate to high levels over the next 24 hours. The 24-hour electron fluence is expected to remain at or above moderate levels over the next days.

Today's estimated international sunspot number (ISN): 091, based on 10 stations.

Solar indices for 29 Jan 2026

Wolf number Catania	163
10cm solar flux	129
AK Chambon La Forêt	030
AK Wingst	031
Estimated Ap	028
Estimated international sunspot number	104 - Based on 12 stations

Noticeable events summary

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

All times in UTC

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