Viewing archive of Thursday, 10 April 2025

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2025 Apr 10 1231 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
10 Apr 2025	168	013
11 Apr 2025	170	015
12 Apr 2025	172	014

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 9 numbered sunspot groups were identified on the visible solar disk. The most complex regions are SIDC Sunspot Group 461 (NOAA Active Region 4048) and SIDC Sunspot Group 469 (NOAA Active Region 4055), both classified as beta- gamma. SIDC Sunspot Group 469, together with the newly rotated region from the east limb, contributed to most of the flaring activity over the past 24 hours. The solar flaring activity is expected to remain at low levels with possible M-class flares 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 under the ongoing influence of a high speed stream. The magnitude of the interplanetary magnetic field (B) remained below 10 nT with a minimum Bz component reaching -7 nT. The solar wind speed was predominantly around 500 km/s with periods reaching 600 km/s. The B field phi angle was entirely in the negative sector (directed towards the Sun). The solar wind conditions are expected to remain enhanced over the next few days under the anticipated influence of an high speed stream.

Geomagnetism

The geomagnetic conditions over the past 24 hours were predominantly unsettled to active. Quiet to active geomagnetic conditions are expected for the next 24 hours with chances for isolated minor storms due to ongoing high speed stream arrivals. Quiet to active conditions are expected to continue on April 11 and April 12.

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 be at the border of moderate to nominal levels in the next 24 hours.

Today's estimated international sunspot number (ISN): 130, based on 18 stations.

Solar indices for 09 Apr 2025

Wolf number Catania	182
10cm solar flux	167
AK Chambon La Forêt	///
AK Wingst	016
Estimated Ap	022
Estimated international sunspot number	136 - Based on 26 stations

Noticeable events summary

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

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