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Daily bulletin on solar and geomagnetic activity from the SIDC

Emesso: 2025 Mar 12 1231 UTC

SIDC Forecast

Brillamenti solari

M-class flares expected (probability >=50%)

Geomagnetism

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

Protoni solari

Quiet

	10cm flux	Ap
12 Mar 2025	165	013
13 Mar 2025	170	014
14 Mar 2025	180	007

Solar Active Regions and flaring

Solar flaring activity was moderate over the past 24 hours, with 1 M-class flare identified. The largest flare was a M1.1 flare (SIDC Flare 3800) peaking on March 11 at 13:04 UTC, which was produced by SIDC Sunspot Group 431 (NOAA Active Region 4024). A total of 11 numbered sunspot groups were identified on the disk over the past 24 hours. SIDC Sunspot Group 428 (NOAA Active Region 4019) is the most complex active region ( Beta-Delta).

Espulsioni di massa coronale

No new Earth-directed Coronal Mass Ejections (CMEs) have been detected in the available coronagraph images.

Vento solare

The solar wind at the Earth is slow, with speeds around 460 km/s and interplanetary magnetic field slightly increased from 6 to 12 nT with the Bz reaching a minimum value of -10 nT. In the next 24h, the solar wind speed may increase due to the influence of the high-speed streams associated with the coronal holes (which reached the central meridian in March 10).

Geomagnetism

Geomagnetic conditions reached active levels (Kp 4- and K Bel 4) early on March 12. Geomagnetic conditions may reach again active levels late on March 12, due to a high-speed stream arrival.

Proton flux levels

The greater than 10 MeV proton flux remained below the 10 pfu threshold and is expected to remain so over the next days.

Electron fluxes at geostationary orbit

The greater than 2 MeV electron flux was above the 1000 pfu threshold on March 11 and is expected to remain so in the upcoming days. The 24h electron fluence was at nominal level and is expected to remain so in the next days.

Today's estimated international sunspot number (ISN): 156, based on 11 stations.

Solar indices for 11 Mar 2025

Wolf number Catania	///
10cm solar flux	161
AK Chambon La Forêt	022
AK Wingst	009
Estimated Ap	011
Estimated international sunspot number	141 - Based on 14 stations

Noticeable events summary

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

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