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Daily bulletin on solar and geomagnetic activity from the SIDC

Emesso: 2025 Jun 02 1231 UTC

SIDC Forecast

Brillamenti solari

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

Geomagnetism

Moderate (ISES: Major) magstorm expected (A>=50 or K=6)

Protoni solari

Warning condition (activity levels expected to increase, but no numeric forecast given)

	10cm flux	Ap
02 Jun 2025	158	068
03 Jun 2025	155	037
04 Jun 2025	155	024

Solar Active Regions and flaring

Solar flaring activity was moderate with one M-class flare and several C-class flares recorded over the past 24 hours. The largest flare was an M3.3 flare (SIDC 4531) peaking on June 02 at 11:18 UTC, associated with SIDC Sunspot Group 469 (NOAA Active Regions 4100; magnetic type beta-gamma). There are currently 5 numbered sunspot groups on the solar disk. SIDC Sunspot Group 469 was responsible for most of the flaring activity observed over the past 24 hours. The rest of these regions were mostly quiet. The solar flaring activity is expected to be moderate over the next 24 hours, with M-class flares expected and a chance for X-class flares.

Espulsioni di massa coronale

No Earth-directed Coronal Mass Ejections (CMEs) were observed in the available coronagraph imagery.

Fori coronali

A mid-latitude, negative-polarity coronal hole (SIDC Coronal Hole 111) began crossing the central meridian today, June 2. An associated high-speed stream may reach Earth starting late on June 5.

Vento solare

Over the past 24 hours, the solar wind parameters were slightly disturbed under the ICME influence. The magnetic field reached values up to 25 nT, later decreasing to the values around 11 nT. The solar wind speed dropped from 1050 km/s to 700 km/s. The southward component of the interplanetary magnetic field fluctuated between -13 nT and 12 nT. Solar wind conditions are expected to remain slightly elevated due to the ICME passage.

Geomagnetism

Geomagnetic conditions reached severe storm levels globally (Kp 8-) between 12:00 and 15:00 UTC on June 1, due to the ICME arrival associated with the CME from early May 31. Locally, moderate storm conditions were observed (K_Bel 6). Further periods of minor to moderate storm conditions may be possible over the next 24 hours, with the ongoing ICME passage.

Proton flux levels

The greater than 10 MeV proton flux decreased below the 10 pfu mark at 22:30 UTC on June 01. The proton flux is expected to continue decreasing over the next 24 hours.

Electron fluxes at geostationary orbit

The greater than 2 MeV electron flux measured by GOES 19 was below the 1000 pfu threshold over the past 24 hours. The greater than 2 MeV electron flux is expected to remain below the threshold over the next 24 hours. The 24-hour electron fluence was at low to moderate levels and is expected to be at normal levels over the next 24 hours.

Today's estimated international sunspot number (ISN): 105, based on 21 stations.

Solar indices for 01 Jun 2025

Wolf number Catania	///
10cm solar flux	150
AK Chambon La Forêt	109
AK Wingst	///
Estimated Ap	086
Estimated international sunspot number	123 - Based on 23 stations

Noticeable events summary

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

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