Viewing archive of Monday, 6 October 2025

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2025 Oct 06 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
06 Oct 2025	148	003
07 Oct 2025	145	003
08 Oct 2025	140	004

Solar Active Regions and flaring

Solar flaring activity was low over the past 24 hours, with four C-class flares identified. This brightest flare was SIDC Flare 5683, a C3 detected on 5 Oct at 23:42 UTC. It is located at the west limb at N10 and probably partially obstructed by the limb. The same location also produced a C2 on 6 Oct at 08:55 UTC. SIDC Sunspot Group 663 (NOAA Active Region [AR] 4242, Beta magnetic configuration) emitted a C2 on 6 Oct at 10:00 UTC. SIDC Sunspot Group 661 (NOAA AR 4241, Beta magnetic configuration) produced a C1 on 6 Oct at 08:49 UTC. Solar flaring activity is expected to be very low over the next 24 hours, with a chance for C-class flares.

Coronal mass ejections

No Earth-directed Coronal Mass Ejections (CME) were observed in the last 24 hours.

Solar wind

The Solar Wind (SW) conditions returned to a slow SW regime during the past 24 hours. The SW speed dropped from 520 to 400 km/s, while the interplanetary magnetic field (B) ranged between 2 and 7 nT, and its North-South component (Bz) fluctuated between -4 and 5 nT. A similar pattern is expected for the next 24 hours, although there is the possibility of a glancing blow associated with SIDC CME 570.

Geomagnetism

During the last 24 hours geomagnetic conditions were both globally and locally quiet (NOAA Kp 1- to 2+ and K BEL 1 to 2). They are expected to remain at the same level, both globally and locally, for the next 24 hours.

Proton flux levels

The greater than 10 MeV proton flux, as measured by the GOES-19 satellite, was at background levels over the past 24 hours and is likely to remain so in the next 24 hours.

Electron fluxes at geostationary orbit

The greater than 2 MeV electron flux as measured by GOES 19 was well above the 1000 pfu threshold during the past 24 hours, with a peak value at 24000 pfu. It is expected to remain at the current levels during the next 24 hours. The 24-hour electron fluence is at high levels since 4 Oct 23:10 UTC and is expected to continue at high levels for the next 24 hours.

Today's estimated international sunspot number (ISN): 164, based on 12 stations.

Solar indices for 05 Oct 2025

Wolf number Catania	///
10cm solar flux	148
AK Chambon La Forêt	010
AK Wingst	010
Estimated Ap	009
Estimated international sunspot number	151 - Based on 14 stations

Noticeable events summary

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

All times in UTC

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