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Daily bulletin on solar and geomagnetic activity from the SIDC

Emesso: 2026 Mar 11 1231 UTC

SIDC Forecast

Brillamenti solari

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

Geomagnetism

Quiet (A<20 and K<4)

Protoni solari

Quiet

	10cm flux	Ap
11 Mar 2026	127	012
12 Mar 2026	124	010
13 Mar 2026	120	014

Solar Active Regions and flaring

Solar flaring activity was low over the past 24 hours, with several C-class flares recorded. The largest flare was a C4.6 flare (SIDC Flare 7159), peaking at 18:45 UTC on March 10, associated with SIDC Sunspot Group 804 (NOAA Active Region 4381; magnetic type beta). There are currently eight numbered active regions on the visible solar disk. SIDC Sunspot Group 804 is approaching the west solar limb and was the main driver of the flaring activity observed over the past 24 hours, together with SIDC Sunspot Group 813 (NOAA Active Region 4389; magnetic type beta). A new region emerged in the northeastern hemisphere and was numbered SIDC Sunspot Group 818 (NOAA Active Region 4391, N06E45; magnetic type alpha), 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 remain low over the next 24 hours, with C-class flares expected and an M-class flare possible.

Espulsioni di massa coronale

No Earth-directed Coronal Mass Ejections (CMEs) have been detected in the available coronagraph images over the past 24 hours.

Fori coronali

A large positive polarity transequatorial coronal hole (SIDC Coronal Hole 154) has started to cross the central meridian. The associated high-speed stream is expected to arrive at Earth starting late on March 13.

Vento solare

Over the past 24 hours, solar wind parameters (ACE and DSCOVR) were slightly elevated, with the solar wind speed reaching values up to 570 km/s. The interplanetary magnetic field remained weak, below 9 nT, with the Bz reaching a minimum value of -8 nT. The magnetic field orientation was predominantly in the negative sector (field directed toward the Sun). Solar wind conditions are expected to gradually return to a slow solar wind regime over the next day, with a chance of a weak enhancement from late on March 13 due to the arrival of a high-speed stream from the large positive polarity coronal hole (SIDC Coronal Hole 154).

Geomagnetism

Geomagnetic conditions reached active levels globally (NOAA Kp = 4-) between 15:00 and 18:00 UTC on March 10 and between 03:00 and 06:00 UTC on March 11. Locally over Belgium, quiet to unsettled conditions were observed (K-Bel = 1 to 3). Mostly quiet to unsettled geomagnetic conditions are expected over the next 24 hours.

Proton flux levels

The greater than 10 MeV proton flux, as measured by the GOES-19 satellite, was at background levels over the past 24 hours and is likely to remain so in the next 24 hours.

Electron fluxes at geostationary orbit

The greater than 2 MeV electron flux measured by GOES-18 and GOES-19 was below the 1000 pfu threshold at the beginning of the reporting period and has fluctuated around the threshold since 16:00 UTC on March 10. The greater than 2 MeV electron flux may exceed the 1000 pfu threshold over the next 24 hours. The electron fluence was at normal to moderate levels and is expected to remain at these levels over the next 24 hours.

Today's estimated international sunspot number (ISN): 110, based on 11 stations.

Solar indices for 10 Mar 2026

Wolf number Catania	///
10cm solar flux	127
AK Chambon La Forêt	026
AK Wingst	016
Estimated Ap	017
Estimated international sunspot number	082 - Based on 21 stations

Noticeable events summary

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

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