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Daily bulletin on solar and geomagnetic activity from the SIDC

Emesso: 2025 Jul 02 1232 UTC

SIDC Forecast

Brillamenti solari

C-class flares expected, (probability >=50%)

Geomagnetism

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

Protoni solari

Quiet

	10cm flux	Ap
02 Jul 2025	126	024
03 Jul 2025	124	031
04 Jul 2025	122	024

Solar Active Regions and flaring

Solar flaring activity over the past 24 hours was low, with few C-class flares recorded. The largest flare was a C1.1 flare, peaking at 11:29 UTC on July 02, associated with SIDC Sunspot Group 513 (NOAA Active Region 4132; magnetic type alpha). There are currently ten numbered active regions on the visible solar disk. SIDC Sunspot Group 537 (NOAA Active Region 4126; beta) is expected to rotate over the west limb in the coming hours. Solar flaring activity is expected to be low over the next 24 hours, with C-class flares very likely and a small chance for M-class flares.

Espulsioni di massa coronale

No Earth-directed CMEs were observed in the available coronagraphic imagery over the past 24 hours.

Vento solare

Over the past 24 hours, solar wind parameters (ACE and DSCOVR) reflected a return to slow solar wind conditions. The solar wind speed decreased from about 530 km/s to around 380 km/s. The interplanetary magnetic field remained below 7 nT, and its southward component fluctuated between -3 nT and 3 nT. Solar wind conditions might become slightly elevated over the next days due to the possible arrival of an ICME associated with a partial halo CME (SIDC CME 523), observed lifting from the Sun on June 28, and the anticipated high-speed stream arrival from the recurrent negative polarity coronal hole (SIDC Coronal Hole 111).

Geomagnetism

Geomagnetic conditions were quiet globally and quiet to unsettled locally, over Belgium (NOAA Kp: 1 to 2, K-Bel: 1 to 3). Geomagnetic conditions are expected to remain at quiet to unsettled levels, with a chance of increasing to active conditions and isolated minor or moderate storm periods on July 02-03, due to the possible arrival of an ICME associated with a partial halo CME (SIDC CME 523) observed lifting from the Sun on June 28, and the expected high-speed stream arrival from the recurrent negative polarity coronal hole (SIDC Coronal Hole 111).

Proton flux levels

The greater than 10 MeV GOES proton flux was below the threshold level over the past 24 hours and is expected to remain so for the next 24 hours.

Electron fluxes at geostationary orbit

The greater than 2 MeV electron flux, as measured by GOES-18 and GOES-19, exceeded the 1000 pfu threshold over the past 24 hours. The greater than 2 MeV electron flux may exceed this threshold again in the coming days. The 24-hour electron fluence was at moderate levels and is expected to remain at moderate levels over the next 24 hours.

Today's estimated international sunspot number (ISN): 145, based on 23 stations.

Solar indices for 01 Jul 2025

Wolf number Catania	182
10cm solar flux	126
AK Chambon La Forêt	010
AK Wingst	009
Estimated Ap	008
Estimated international sunspot number	154 - Based on 30 stations

Noticeable events summary

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

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