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Daily bulletin on solar and geomagnetic activity from the SIDC

Существующий: 2025 Jun 06 1231 UTC

SIDC Forecast

Солнечные вспышки

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

Geomagnetism

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

Солнечные протоны

Quiet

	10cm flux	Ap
06 Jun 2025	129	015
07 Jun 2025	125	024
08 Jun 2025	120	012

Solar Active Regions and flaring

Solar flaring activity was low, with only C-class flares recorded over the past 24 hours. The largest flare was a C8.7 flare (SIDC Flare 4559), peaking at 15:47 UTC on June 05, associated with SIDC Sunspot Group 513 (NOAA Active Region 4105; magnetic type beta- gamma). There are currently seven numbered active regions on the visible solar disc. SIDC Sunspot Group 513 was the main driver of the flaring activity observed over the past 24 hours. Low flaring activity was also produced by SIDC Sunspot Group 469 (NOAA Active Region 4100; magnetic type beta), which is now approaching the west limb. Three new active regions emerged during the period, located in the northeast, southeast, and southwest quadrants of the visible solar disc and numbered SIDC Sunspot Group 515 (magnetic type beta), 516 (magnetic type alpha), and 517 (magnetic type alpha), respectively. None produced any significant flaring activity. SIDC Sunspot Group 508 (NOAA Active Region 4099) is expected to rotate over the west limb over the next day. Solar flaring activity is expected to be low over the next 24 hours, with C-class flares very likely and a chance for M-class flares.

Выбросы корональной массы

No Earth-directed CMEs have been detected in the available coronagraph imagery over the past 24 hours.

Солнечный ветер

Over the past 24 hours the solar wind parameters (ACE and DSCOVR) indicated a return to a near slow solar wind regime. The solar wind speed decreased from values around 630 km/s to 450 km/s. The interplanetary magnetic field was below 5 nT. The southward component of the interplanetary magnetic field fluctuated between -3 nT and 3 nT. The magnetic field orientation was predominantly in the negative sector (field directed towards the Sun). Slow solar wind conditions are expected to prevail over the next days, with a possibility for weak enhancements on June 06 and June 07 due to the anticipated arrival of a high-speed stream from a mid-latitude negative polarity coronal hole (SIDC Coronal Hole 111) and the potential glancing blow arrival of coronal mass ejection (SIDC CME 514) associated with the filament eruption on June 04.

Geomagnetism

Geomagnetic conditions were at quiet to unsettled levels globally (NOAA Kp: 2- to 3+) over the past 24 hours. Locally over Belgium, active conditions were observed (K-Bel = 4) between 18:00 and 21:00 UTC on June 05. Mostly quiet to unsettled conditions are expected to persist over the next days, with a chance of isolated active and minor storm periods on June 06 - 07 due to the possible high-speed stream and ICME arrival.

Proton flux levels

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

Electron fluxes at geostationary orbit

The greater than 2 MeV electron flux, as measured by GOES-19, exceeded the 1000 pfu threshold over the past 24 hours. The electron flux is expected to continue exceeding this threshold over the next day. The 24-hour electron fluence was at normal to moderate levels and is expected to remain at these levels over the next day.

Today's estimated international sunspot number (ISN): 105, based on 18 stations.

Solar indices for 05 Jun 2025

Wolf number Catania	075
10cm solar flux	128
AK Chambon La Forêt	021
AK Wingst	015
Estimated Ap	017
Estimated international sunspot number	077 - Based on 17 stations

Noticeable events summary

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

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