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Daily bulletin on solar and geomagnetic activity from the SIDC

Emesso: 2026 Apr 09 1231 UTC

SIDC Forecast

Brillamenti solari

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

Geomagnetism

Minor storm expected (A>=30 or K=5)

Protoni solari

Quiet

	10cm flux	Ap
09 Apr 2026	109	012
10 Apr 2026	106	037
11 Apr 2026	106	031

Solar Active Regions and flaring

Solar flaring activity reached moderate levels over the past 24 hours, with one M-class flare and several C-class flares recorded. The largest flare was an M1.0 flare (SIDC Flare 7388), peaking at 08:45 UTC on April 09, associated with SIDC Sunspot Group 838 (NOAA Active Region 4409; magnetic type beta-gamma). There are currently six numbered active regions on the visible solar disk. SIDC Sunspot Group 838, which is approaching the west limb, was the main driver of the flaring activity observed over the past 24 hours, together with SIDC Sunspot Group 842 (NOAA Active Region 4414; magnetic type alpha). SIDC Sunspot Group 836 (NOAA Active Region 4405; magnetic type alpha) and SIDC Sunspot Group 805 (NOAA Active Regions 4408 and 4413; magnetic type beta) are also expected to rotate over the west limb over the next day. A new region emerged and was numbered SIDC Sunspot Group 843 (magnetic type beta) near S03W33, but it remained quiet. The remaining active regions are relatively simple (magnetic type alpha or beta) and did not produce any significant flaring activity. Solar flaring activity is expected to be low over the next 24 hours, with C-class flares very likely and a chance of M-class flares.

Espulsioni di massa coronale

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

Vento solare

Over the past 24 hours, solar wind parameters (ACE and DSCOVR) reflected the slow solar wind regime. The solar wind speed ranged between 350 km/s and 400 km/s. The interplanetary magnetic field remained weak, below 6 nT. Slow solar wind conditions are expected on April 09. From late on April 9, solar wind parameters may become slightly elevated due to the possible arrival of a high-speed stream from a positive polarity coronal hole (SIDC Coronal Hole 154).

Geomagnetism

Geomagnetic conditions were quiet globally and quiet to unsettled locally over Belgium (Kp 1 to 2 and K-Bel 1 to 3). Mostly quiet conditions are expected on April 09. From late on April 09 - early April 10, active conditions are expected, with a possible isolated minor to moderate storm interval in response to the arrival of the high-speed stream from a positive polarity coronal hole (SIDC Coronal Hole 154).

Proton flux levels

The greater than 10 MeV proton flux, as measured by GOES-18, was below the 10pfu 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-19, exceeded the 1000 pfu alert threshold over the past 24 hours, with a peak value of 12587 pfu. It is expected to remain above the alert threshold over the next 24 hours. The 24-hour electron fluence was at moderate to high levels over the past 24 hours and is expected to remain at moderate to high levels over the next 24 hours.

Today's estimated international sunspot number (ISN): 068, based on 23 stations.

Solar indices for 08 Apr 2026

Wolf number Catania	079
10cm solar flux	108
AK Chambon La Forêt	012
AK Wingst	008
Estimated Ap	007
Estimated international sunspot number	078 - Based on 24 stations

Noticeable events summary

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

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