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Daily bulletin on solar and geomagnetic activity from the SIDC

Emesso: 2025 Mar 15 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
15 Mar 2025	185	018
16 Mar 2025	185	017
17 Mar 2025	185	017

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 3844) peaking on March 14 at 22:21 UTC, which was produced by SIDC Sunspot Group 437 (NOAA Active Region 4030). A total of 10 numbered sunspot groups were identified on the disk over the past 24 hours. SIDC Sunspot Group 428 (NOAA Active Region 4019) has the most complex magnetic configuration (Beta-Delta) and was decreasing over the past 24 hours. Solar flaring activity is expected to be low over the next 24 hours, with C-class flares very likely and a chance for M-class flares.

Espulsioni di massa coronale

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

Vento solare

Earth continued to be under the influence of high speed streams (HSS). The solar wind speed was around 560 km/s. The interplanetary magnetic field was between 8 nT and 5 nT, with the Bz reaching a minimum value of -6 nT. In the next 24 hours, we expect a gradual transition from fast to slow solar wind.

Geomagnetism

Geomagnetic conditions were globally and locally unsettled to active (KP4) in the past 24 hours. Unsettled conditions are expected in the next 24 hours.

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 exceeded the 1000 pfu threshold for most of the time during the past 24 hours, and is expected to remain above the threshold during the next 24 hours. The 24h electron fluence was at normal levels and is expected to remain so.

Today's estimated international sunspot number (ISN): 161, based on 09 stations.

Solar indices for 14 Mar 2025

Wolf number Catania	221
10cm solar flux	180
AK Chambon La Forêt	031
AK Wingst	022
Estimated Ap	025
Estimated international sunspot number	173 - Based on 17 stations

Noticeable events summary

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

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