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Daily bulletin on solar and geomagnetic activity from the SIDC

Emesso: 2026 Apr 10 1231 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
10 Apr 2026	090	024
11 Apr 2026	092	028
12 Apr 2026	094	017

Solar Active Regions and flaring

Solar flaring activity was very low over the past 24 hours. The X-ray flux remained below C level. There are currently two numbered active regions on the visible solar disk. SIDC Sunspot Group 805 (NOAA Active Regions 4408, 4413) and SIDC Sunspot Group 838 (NOAA Active Region 4409) have rotated over the west limb. SIDC Sunspot Group 820 (NOAA Active Region 4415) and SIDC Sunspot Group 842 (NOAA Active Region 4414) are relatively simple (magnetic type alpha) 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.

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 conditions (ACE and DSCOVR) became slightly disturbed, with the interplanetary magnetic field reaching 14 nT at around 07:20 UTC on April 10. The north-south component of the interplanetary magnetic field (Bz) ranged between -8 nT and 12 nT. The solar wind speed followed an increased from 380 km/s to 500 km/s. The interplanetary magnetic field orientation switched to the predominantly positive sector (field directed away from the Sun) from about 04:30 UTC on April 10. This may be associated with the arrival of a compression region ahead of the expected high-speed stream from a positive polarity coronal hole (SIDC Coronal Hole 154). Solar wind conditions are expected to remain slightly elevated over the next days while Earth remains under the influence of the high-speed stream.

Geomagnetism

Geomagnetic conditions reached active levels globally (NOAA Kp = 4) between 00:00 and 03:00 UTC on April 10. Locally over Belgium, quiet to unsettled conditions were observed (K-Bel = 1 to 3). Mostly unsettled to active geomagnetic conditions are expected over the next 24 hours, with a chance of an isolated minor to moderate storm interval in response to the ongoing high-speed stream influence 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, was above the 1000 pfu alert threshold until 18:35 UTC on April 09 and remained below the threshold for the rest of the period. It is expected to remain below 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 decrease to normal to moderate levels over the next 24 hours.

Today's estimated international sunspot number (ISN): 026, based on 21 stations.

Solar indices for 09 Apr 2026

Wolf number Catania	080
10cm solar flux	098
AK Chambon La Forêt	015
AK Wingst	006
Estimated Ap	006
Estimated international sunspot number	066 - Based on 30 stations

Noticeable events summary

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

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