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Daily bulletin on solar and geomagnetic activity from the SIDC

Emesso: 2026 Feb 02 1231 UTC

SIDC Forecast

Brillamenti solari

M-class flares expected (probability >=50%)

Geomagnetism

Quiet (A<20 and K<4)

Protoni solari

Quiet

	10cm flux	Ap
02 Feb 2026	162	007
03 Feb 2026	164	007
04 Feb 2026	166	035

Solar Active Regions and flaring

A total of 8 numbered sunspot groups were identified on the disk over the past 24 hours. Solar flaring activity was very high over the past 24 hours, with 5 X-class flares and 16 M-class flares identified. They originated from SIDC Sunspot Group 784 (NOAA Active Region 4366), currently located at N13E34. It has a Beta-Gamma-Delta magnetic configuration and was growing over the past 24 hours. The first X-class flare was an X1.0 one (SIDC Flare 6796) peaking on February 01 at 12:33 UTC. The second one and largest, was an X8.1 one (SIDC Flare 6808), peaked on February 01 at 23:57 UTC, two more followed shortly after (X1.5 at 00:22 UTC and X2.8 at 00:36 UTC, February 2). The last X-class flare occurred at 08:14 UTC on February 2, with a peak at X1.6. Solar flaring activity is expected to be high over the next 24 hours, with M-class flares very likely and more X-class flares possible.

Espulsioni di massa coronale

A partial halo CME was observed at 00:48 UTC on February 2 by LASCO C2, directed to the northeast, associated with the X8.1 flare peaking at 23:57 UTC on February 1, and a large EUV wave. The CME has an angular width of about 150 degrees, with an Earth directed component. A preliminary speed derived from the available data is around 700 km/s, giving an expected arrival time on the second half of February 4 (this will be updated when more data becomes available and EUHFORIA simulations results are obtained). There is still no coronagraph data corresponding to the last X-flare, so another associated CME cannot be discarded.

Vento solare

The Earth is within a slow solar wind stream. The solar wind speed is around 300 km/s and the interplanetary magnetic field around 5 nT. Simmilar conditions are expected for the next 24 hours.

Geomagnetism

Geomagnetic conditions have been quiet to unsettled in the last 24 hours (Kp up to 3 and K_BEL up to 2). Similar conditions can be expected for the next 24 hours.

Proton flux levels

The greater than 10 MeV proton flux remained below the 10 pfu threshold int he last 24 hours.

Electron fluxes at geostationary orbit

The greater than 2 MeV electron flux as measured by GOES 18 and GOES 19 has been above the 1000 pfu threshold for most of the last 24 hours. The greater than 2 MeV electron flux is expected to slowly return to low levels in the next 24 hours. The 24-hour electron fluence was at moderate levels and is expected to go to normal levels over the next days.

Today's estimated international sunspot number (ISN): 128, based on 08 stations.

Solar indices for 01 Feb 2026

Wolf number Catania	///
10cm solar flux	162
AK Chambon La Forêt	009
AK Wingst	006
Estimated Ap	004
Estimated international sunspot number	104 - Based on 15 stations

Noticeable events summary

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

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