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Daily bulletin on solar and geomagnetic activity from the SIDC

Emesso: 2025 Mar 25 1242 UTC

SIDC Forecast

Brillamenti solari

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

Geomagnetism

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

Protoni solari

Quiet

10cm fluxAp
25 Mar 2025150010
26 Mar 2025150049
27 Mar 2025150064

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 C3.4 flare (SIDC Flare 3903) peaking at 00:40 UTC on March 25, which was produced by SIDC Sunspot Group 450 (NOAA Active Region 4036). During the flare, the source region (SIDC 450) of the flare had beta-gamma configuration of its photospheric magnetic field. A total of 6 numbered sunspot groups were identified on the disk over the past 24 hours. SIDC Sunspot Group 450 is the complex region with its beta-gamma magnetic configurations, which produced several C-class flares in 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 Earth-directed coronal mass ejections (CME) were detected in the available coronagraph observations during last 24 hours.

Fori coronali

SIDC Coronal Hole 96 (positive polarity, northern hemisphere) began to traverse the central meridian on March 25. SIDC Coronal Holes 60 and 82 (positive polarity) are still crossing the central meridian and the associated high speed streams are expected to arrive at Earth from March 25.

Vento solare

Earth is presently inside the slow solar wind regime. The solar wind speed ranged from 340 km/s to 420 km/s and the interplanetary magnetic field ranged from 4 nT to 10 nT. The North-South component (Bz) ranged between -9 and 8 nT. Slow solar wind conditions are expected to continue over the next 24 hours unless the high speed stream from the coronal hole which started to cross the central meridian on Mar 22 (positive polarity) hits the Earth.

Geomagnetism

Geomagnetic conditions were globally and locally at quiet to active conditions (NOAA Kp and K_BEL 1 to 4). In the next 24 hours, active to moderate storm conditions (K 4 to 6) are possible if the high speed stream from the coronal hole which started to cross the central meridian on Mar 22 (positive polarity) hits the Earth.

Proton flux levels

The greater than 10 MeV GOES proton flux was below the threshold level over the past 24 hours and is expected to remain so for the next 24 hours. However, a proton event over the next day cannot be excluded due to SIDC Sunspot Group 450 (NOAA Active Region 4036).

Electron fluxes at geostationary orbit

The greater than 2 MeV electron flux, as measured by GOES-16 and GOES-18 satellites, remained below the 1000 pfu threshold level over the past 24 hours and is expected to remain so in the coming 24 hours. The 24h electron fluence is presently at normal level, and it is expected to remain so in the next 24 hours.

Today's estimated international sunspot number (ISN): 085, based on 14 stations.

Solar indices for 24 Mar 2025

Wolf number Catania///
10cm solar flux156
AK Chambon La Forêt025
AK Wingst020
Estimated Ap021
Estimated international sunspot number083 - Based on 18 stations

Noticeable events summary

DayBeginMaxFineLocStrengthOP10cmCatania/NOAARadio burst types
Nessuna

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

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Notizie sul meteo spaziale

Ultimo brillamento X2025/03/28X1.1
Ultimo brillamento M2025/04/01M2.5
Ultima tempesta geomagnetica2025/03/27Kp5 (G1)
Giorni senza macchie
Ultimo giorno senza macchie2022/06/08
Media mensile Numero di Macchie Solari
marzo 2025134.2 -20.4
aprile 2025143 +8.8
Ultimi 30 giorni130.4 -16.1

Questo giorno nella storia*

Brillamenti solari
12002M8.82
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DstG
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*dal 1994

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