Viewing archive of Friday, 11 April 2025

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2025 Apr 11 1252 UTC

SIDC Forecast

Solar flares

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

Geomagnetism

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

Solar protons

Quiet

	10cm flux	Ap
11 Apr 2025	155	018
12 Apr 2025	157	012
13 Apr 2025	157	015

Solar Active Regions and flaring

Solar flaring activity was at low levels over the past 24 hours with background C-class flaring. A total of 8 numbered sunspot groups were identified on the disk over the past 24 hours. The most complex regions are SIDC Sunspot Group 461 (NOAA Active Region 4048), which is now approaching the west limb, SIDC Sunspot Group 469 (NOAA Active Region 4055) and SIDC Sunspot Group 470 (NOAA Active Region 4058), which have both exhibited further growth and flux emergence. These three regions are classified as magnetic type beta-gamma. The largest flare was a C4.4 flare (SIDC Flare 4073) peaking on April 11 at 07:14 UTC, produced by SIDC Sunspot Group 469, which contributed to most of the flaring activity over the past 24 hours. The solar flaring activity is expected to remain at low levels to moderate levels with likely M-class flaring over the next 24 hours.

Coronal mass ejections

No Earth-directed coronal mass ejections (CMEs) are observed in the available coronagraph imagery over the past 24 hours.

Coronal holes

The negative polarity coronal hole which first crossed the central meridian on April 07 continues to partly reside there. High speed stream emanating from it might be expected at Earth starting on April 10.

Solar wind

Over the past 24 hours the solar wind parameters (ACE and DSCOVR) reflected mildly enhanced conditions reflecting mild connection a high speed stream emanating from a negative polarity coronal hole. The magnitude of the interplanetary magnetic field (B) reached a maximum value of 8 nT with a minimum Bz of -7.5 nT. The solar wind speed varied at close to 500 km/s. The B field phi angle was predominantly in the negative sector (directed towards the Sun). The solar wind conditions are expected to remain enhanced over the next few days under the influence of a high speed stream.

Geomagnetism

The geomagnetic conditions over the past 24 hours were quiet to active. Predominantly quiet to active geomagnetic conditions with remaining chances for isolated minor storms are expected for the next days.

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 18 electron fluxes has exceeded the 1000 pfu threshold over the last 24 hours and is expected to exceed 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): 125, based on 29 stations.

Solar indices for 10 Apr 2025

Wolf number Catania	155
10cm solar flux	153
AK Chambon La Forêt	028
AK Wingst	018
Estimated Ap	018
Estimated international sunspot number	132 - Based on 26 stations

Noticeable events summary

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

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