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Daily bulletin on solar and geomagnetic activity from the SIDC

Emesso: 2025 Jun 09 1239 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
09 Jun 2025	113	019
10 Jun 2025	112	027
11 Jun 2025	111	021

Solar Active Regions and flaring

Solar flaring activity was low over the past 24 hours, with only C-class flares recorded. A total of seven numbered active regions were visible on the solar disk during this period. Most regions exhibited simple photospheric magnetic field configurations, predominantly Alpha or Beta, and remained stable or showed signs of decay. SIDC Sunspot Group 520, located at N04E25, was the only region showing clear signs of growth, maintaining a Beta magnetic configuration. The largest event was a C1.9 flare (SIDC Flare 4587), which peaked at 13:03 UTC on June 08 and originated from SIDC Sunspot Group 513 (NOAA Active Region 4105), currently located at S16E07. SIDC Sunspot Group 513 remained the primary source of flaring activity. Solar flaring activity is expected to remain low over the next 24 hours, with C-class flares very likely and a small chance for isolated M-class flares.

Espulsioni di massa coronale

A halo coronal mass ejection (SIDC CME 517) was detected in LASCO/C2 coronagraph imagery starting at 07:36 UTC on June 8. The CME was directed primarily toward the southwest as seen from Earth and is associated with a filament eruption from behind the southwest limb. Given the source region's location behind the limb, no Earth-directed component is expected, and the CME is not forecast to have any geomagnetic impact. No other Earth-directed CMEs were identified in the available coronagraph data over the past 24 hours.

Fori coronali

Four coronal holes are currently visible on the solar disk. SIDC Coronal Hole 118, an equatorial coronal hole with negative polarity, crossed the central meridian on June 8 and has since progressed toward the western limb. SIDC Coronal Hole 104, a mid-latitude southern coronal hole with positive polarity, is positioned on the eastern side of the Sun. Finally, SIDC Coronal Hole 111, a mid-latitude southern coronal hole with negative polarity, and SIDC Coronal Hole 117, a mid-latitude northern coronal hole with positive polarity, crossed the central meridian on June 2 and June 5 respectively, and are now nearing the western limb.

Vento solare

Solar wind conditions were moderately disturbed over the past 24 hours due to the continued influence of an interplanetary coronal mass ejection (ICME) that arrived yesterday. The total interplanetary magnetic field (Bt) remained elevated, fluctuating between 5 and 12 nT. The Bz component exhibited significant variability, ranging between -9.5 and +10.2 nT, with extended periods of southward orientation that contributed to geomagnetic activity. The solar wind speed showed a gradual increase from approximately 400 km/s to 550 km/s. On June 10 and 11, the arrival of a high-speed solar wind stream is expected, originating from SIDC Coronal Hole 118, an equatorial coronal hole with negative polarity that crossed the central meridian on June 8 and is now nearing the western limb.

Geomagnetism

Geomagnetic conditions were active both globally and locally over the past 24 hours. The NOAA Kp index reached a maximum of 4, and the K_BEL index also recorded values up to 4. This activity was driven by moderately disturbed solar wind conditions associated with the continued influence of an interplanetary coronal mass ejection (ICME) that arrived yesterday, and particularly by prolonged periods of southward orientation of the Bz component. Over the next 24 hours, active conditions with possible storm-level (K-index up the 6) intervals are expected as Earth begins to experience the influence of the anticipated high-speed solar wind stream associated with SIDC Coronal Hole 118.

Proton flux levels

The greater-than-10 MeV proton flux, as measured by GOES-18, remained at nominal levels over the past 24 hours and is expected to stay at nominal levels throughout the next 24 hours. No solar energetic particle events were detected, and none are currently anticipated.

Electron fluxes at geostationary orbit

The greater-than-2 MeV electron flux, as measured by the GOES-19 satellite, remained below the 1000 pfu alert threshold over the past 24 hours. While the GOES-18 satellite briefly recorded values reaching this threshold. Electron fluxes are expected to stay mostly below the alert threshold during the next 24 hours. The 24-hour electron fluence remained at normal to moderate levels and is anticipated to persist at those levels throughout the next day.

Today's estimated international sunspot number (ISN): 084, based on 20 stations.

Solar indices for 08 Jun 2025

Wolf number Catania	///
10cm solar flux	115
AK Chambon La Forêt	034
AK Wingst	018
Estimated Ap	018
Estimated international sunspot number	070 - Based on 22 stations

Noticeable events summary

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

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