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Daily bulletin on solar and geomagnetic activity from the SIDC

Существующий: 2026 Jun 03 1236 UTC

SIDC Forecast

Солнечные вспышки

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

Geomagnetism

Active conditions expected (A>=20 or K=4)

Солнечные протоны

Quiet

	10cm flux	Ap
03 Jun 2026	149	015
04 Jun 2026	151	015
05 Jun 2026	153	059

Solar Active Regions and flaring

Solar flaring activity was high over the past 24 hours. There were 1 X-class flare and 3 M-class flares recorded. There are currently 10 numbered regions on the disk. The largest flare was an X1.0 flare (SIDC flare 7842), with peak time on June 03 11:28 UTC, as measured by GOES-19. This was produced by SIDC Sunspot Group 860 (NOAA Active Region 4455), which increased in complexity and has beta-gamma magnetic type. This region was responsible for all the M-class flaring, including also an M9.3 flare (SIDC Flare 7838) peaking on June 03 at 01:36 UTC, which was associated with a Type II and Type IV radio emission, as well as an M7.7 flare (SIDC flare 7840) at 07:00 UTC on June 03 with Type II radio emission. Sunspot Groups 886 and 887 (NOAA Active Region 4458 and 4459) also grew over the period and have magnetic type beta. A new region rotated onto the disk in the north-east and was numbered SIDC Sunspot Group 890 (NOAA Active Region 4462). The remaining regions are simple and mostly quiet. Solar flaring activity is expected to be moderate over the next 24 hours, with C-class flares expected and M-class flares probable with a chance for X-class flares.

Выбросы корональной массы

Multiple Coronal Mass Ejections (CMEs) were seen associated with the M-class flares from SIDC Sunspot Group 860 (NOAA Active Region 4455). On disk dimmings were seen related to the M1.2 and M3.3 flares (SIDC Flares 7825 and 7826) on June 02. However, due to simultaneous CMEs on the limb and backside these associated CMEs are difficult to detect in the coronagraph imagery and analysis is ongoing. A faint halo Coronal Mass Ejection was detected in SOHO LASCO-C2 and seen STEREO-A COR2 starting at June 03 at 01:53 UTC. This CME was associated with the M9.3 flare (SIDC flare 7838) and a second partial halo CME (directed to the north-west) was detected in SOHO LASCO-C2 from 07:58 UTC on June 03. This CME was associated with the M7.7 flare (SIDC flare 7840), with peak time 07:00 UTC on June 03. Modelling of these events are ongoing but initial estimates indicate possible first arrival from these events on June 05. Any possible CME associated with the X1.0 flare will be analysed whet the data becomes available.

Солнечный ветер

Over the past 24 hours, the solar wind parameters reflected slow solar wind conditions. The solar wind speed increased slightly from 400 to 450 km/s. The total magnetic field ranged between 6 and 10 nT and showed some possible transient feature from 03:30 UTC on June 03. Bz had a minimum of -5 nT. The interplanetary magnetic field phi angle was mostly in the negative sector (directed towards the Sun). Enhanced solar wind speed and magnetic field are expected on June 03 and June 04 due the CIR and high speed stream associated with the positive polarity coronal hole which began to cross the central meridian on May 31 (SIDC Coronal Hole 166).

Geomagnetism

The geomagnetic conditions were at quiet to unsettled levels globally and locally (NOAA Kp and K Bel 1-3). Active conditions with possible minor storm intervals are possible from over the next 24 hours, due to the possible high speed stream influence.

Proton flux levels

The greater than 10 MeV proton flux was below the 10 pfu threshold over the past 24 hours. It is expected to remain below this threshold level over the next 24 hours.

Electron fluxes at geostationary orbit

The greater than 2 MeV electron flux, as measured by GOES-19, was briefly above the 1000 pfu threshold and reached a maximum value of 3421. The greater than 2 MeV electron flux is expected to be elevated but below this threshold over the next 24 hours. The electron fluence was at normal levels and is expected to be at normal levels for the next 24 hours.

Today's estimated international sunspot number (ISN): 139, based on 14 stations.

Solar indices for 02 Jun 2026

Wolf number Catania	///
10cm solar flux	146
AK Chambon La Forêt	015
AK Wingst	008
Estimated Ap	007
Estimated international sunspot number	125 - Based on 21 stations

Noticeable events summary

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

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