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Daily bulletin on solar and geomagnetic activity from the SIDC

Emesso: 2025 Apr 07 1239 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
07 Apr 2025	166	013
08 Apr 2025	164	016
09 Apr 2025	164	011

Solar Active Regions and flaring

Solar flaring activity was at low levels over the past 24 hours with only C-class flared observed. The strongest activity was a C2.9 flare (SIDC Flare 4040) peaking on April 06 at 15:53 UTC, which was produced by SIDC Sunspot Group 458 (NOAA Active Region 4045). The region has meanwhile decayed into a plage. A total of 10 numbered sunspot groups were identified on the disk over the past 24 hours. The largest regions, responsible for most of the on-dick C-class flaring activity are SIDC Sunspot Group 461 (NOAA Active Region 4048) and SIDC Sunspot Group 468 (NOAA Active Region 4054), both classified as magnetic type beta. Solar flaring activity is expected to be at low levels over the next 24 hours with possible M-class flares.

Espulsioni di massa coronale

No Earth-directed coronal mass ejections (CMEs) are observed in the available coronagraph imagery.

Fori coronali

A negative polarity coronal hole has crossed the central meridian over the past 24 hours. High speed stream emanating from it might be expected at Earth starting on April 10.

Vento solare

Over the past 24 hours the solar wind parameters (ACE and DSCOVR) reflected a waning influence from a high speed stream. The interplanetary magnetic field (B) was relatively weak with a maximum value of 7 nT and a minimum Bz of -5 nT. The solar wind speed was gradually decreasing to values currently below 500 km/s. The B field phi angle was in the negative sector (directed towards the Sun). The solar wind conditions are expected to continue their return towards slow solar wind conditions with possible further slight enhancements due to a weak connection to a negative polarity coronal hole, which crossed the central meridian on April 04.

Geomagnetism

The geomagnetic conditions over the past 24 hours were predominantly unsettled with an isolated active period recorder locally over Belgium between 21h and 22h UTC on April 06. Predominantly quiet to unsettled geomagnetic conditions are expected for the next 48 hours with possible isolated active levels.

Proton flux levels

Over the past 24 hours the greater than 10 MeV GOES proton flux has been at nominal levels and is expected to remain so over the next days.

Electron fluxes at geostationary orbit

The greater than 10 MeV GOES 16 and GOES 18 electron fluxes have exceeded the 1000 pfu threshold over the last 24 hours and are expected to remain largely above the 1000 pfu threshold in the next 24 hours. The 24-hour electron fluence was at moderate levels and is expected to remain so in the next 24 hours.

Today's estimated international sunspot number (ISN): 154, based on 18 stations.

Solar indices for 06 Apr 2025

Wolf number Catania	///
10cm solar flux	167
AK Chambon La Forêt	025
AK Wingst	022
Estimated Ap	076
Estimated international sunspot number	170 - Based on 27 stations

Noticeable events summary

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

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