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Daily bulletin on solar and geomagnetic activity from the SIDC

Emesso: 2025 Apr 09 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
09 Apr 2025	161	013
10 Apr 2025	162	022
11 Apr 2025	163	016

Solar Active Regions and flaring

Solar flaring activity was at moderate levels over the past 24 hours with background C-class flaring and an M1.5-flare (SIDC Flare 4051), peak time at 22:22 UTC on April 08, produced by SIDC Sunspot Group 461 (NOAA Active Region 4048). A total of 9 numbered sunspot groups were identified on the visible solar disk with SIDC Sunspot Group 461 and SIDC Sunspot Group 469 (NOAA Active Region 4055) being the most complex and most active regions, both exhibiting beta-gamma magnetic type classification. Two new regions have emerged: SIDC Sunspot Group 470 near N18W15, classified as magnetic type beta, and SIDC Sunspot Group 471 near N12E64. Some low levels of activity were detected from a region behind the east limb, which is expected to rotate onto the visible solar disc later on April 09. The solar flaring activity is expected to remain at low to moderate levels with likely M-class flares over the next 24 hours.

Espulsioni di massa coronale

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

Fori coronali

A 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.

Vento solare

Over the past 24 hours the solar wind parameters (ACE and DSCOVR) exhibited enhanced conditions under the influence of a high speed stream. The interplanetary magnetic field (B) reached a maximum value of 12 nT and a minimum Bz of -11.4 nT. The solar wind speed was smoothly varying between 470 km/s and 551 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 under the influence of a high speed stream over the next few days with a possible new arrival expected on April 10.

Geomagnetism

The geomagnetic conditions over the past 24 hours reached minor storm levels. Quiet to active geomagnetic conditions are expected for the next 24 hours with remaining chances for isolated minor storms. Unsettled conditions to minor storm levels might be expected for April 10 and April 11 with an expected additional high speed stream arrival related to the negative polarity coronal hole which continues to reside on the central meridian.

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 for prolonged periods of time over the last 24 hours and is 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): 135, based on 19 stations.

Solar indices for 08 Apr 2025

Wolf number Catania	148
10cm solar flux	159
AK Chambon La Forêt	035
AK Wingst	023
Estimated Ap	024
Estimated international sunspot number	136 - Based on 29 stations

Noticeable events summary

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

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