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Daily bulletin on solar and geomagnetic activity from the SIDC

Emesso: 2025 Mar 14 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
14 Mar 2025	170	028
15 Mar 2025	175	007
16 Mar 2025	178	007

Solar Active Regions and flaring

Solar flaring activity was low over the past 24 hours, with only C-class flares identified. The largest flare was a C7.9 flare (SIDC Flare 3832) peaking on March 13 at 19:35 UTC, which was produced by SIDC Sunspot Group 428 (NOAA Active Region 4019). A total of 11 numbered sunspot groups were identified on the disk over the past 24 hours. SIDC Sunspot Group 398 (NOAA Active Region 4021) and SIDC Sunspot Group 428 (NOAA Active Region 4019) have the most complex magnetic configuration (Beta-Delta). 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.

Fori coronali

A small negative polarity mid-latitude coronal hole first reached the central meridian mid March 13. A high-speed stream from this coronal hole may enhance the solar wind environment near Earth on March 16.

Vento solare

Earth continued to be under the influence of high speed streams (HSS). The solar wind speed ranged from 500 km/s to 560 km/s. The interplanetary magnetic field was around 8 nT, with the Bz reaching a minimum value of -7 nT. In the next 24 hours, we expect a gradual transition from fast to slow solar wind.

Geomagnetism

Geomagnetic conditions were mainly active to minor storm levels, but reached moderate storm levels during an isolated period beginning of March 14 (Kp 6-). Unsettled 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): 171, based on 11 stations.

Solar indices for 13 Mar 2025

Wolf number Catania	///
10cm solar flux	175
AK Chambon La Forêt	043
AK Wingst	031
Estimated Ap	037
Estimated international sunspot number	165 - Based on 16 stations

Noticeable events summary

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

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