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Daily bulletin on solar and geomagnetic activity from the SIDC

Emesso: 2025 Apr 05 1231 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
05 Apr 2025	180	041
06 Apr 2025	178	031
07 Apr 2025	176	017

Solar Active Regions and flaring

Solar flaring activity was low, with only C-class flares recorded over the past 24 hours. The largest flare was a C5.7 flare (SIDC Flare 4026), peaking at 23:38 UTC on April 4, associated with SIDC Sunspot Group 455 (NOAA Active Region 4043; beta), which has begun to rotate over the west limb. There are currently twelve numbered active regions visible on the solar disk. Two new active regions, SIDC Sunspot Group 468 and SIDC Sunspot Group 469, have emerged in the southeastern and northeastern quadrants, respectively. SIDC Sunspot Group 461 (NOAA Active Region 4048; beta-gamma), which remains the largest and most magnetically complex region on the disk, was growing but produced only two C-class flares over the past 24 hours. Low flaring activity was also produced by SIDC Sunspot Group 465 (NOAA Active Region 4051; beta) and SIDC Sunspot Group 466 (NOAA Active Region 4052; beta). Other regions on the disk have simple photospheric magnetic field configurations (alpha and beta) and did not show any significant flaring activity. Solar flaring activity is expected to be at low to moderate levels over the next 24 hours, with M-class flares likely and a small chance for X-class flares.

Espulsioni di massa coronale

No Earth-directed Coronal Mass Ejections (CMEs) have been detected in the available coronagraph images.

Vento solare

Over the past 24 hours, solar wind parameters (ACE and DSCOVR) remained slightly disturbed due to the arrival of a high-speed stream from a negative polarity coronal hole that began crossing the central meridian on April 1. The interplanetary magnetic field started this 24-hour period around 13 nT and then gradually decreased to values near 8 nT. The solar wind speed ranged between 500 km/s and 560 km/s. The southward component of the interplanetary magnetic field fluctuated between –11 nT and 10 nT. The magnetic field orientation was predominantly in the negative sector (field directed toward the Sun). Solar wind conditions are expected to remain slightly elevated over the next few days due to the ongoing influence of the high-speed stream.

Geomagnetism

Geomagnetic conditions reached moderate storm levels globally (Kp 6-) between 00:00 UTC and 03:00 UTC on April 5. Locally over Belgium, only minor geomagnetic storm conditions were observed (K-Bel: 5). Active conditions are expected over the next day, with a possible isolated minor storm period due to ongoing high-speed stream influence.

Proton flux levels

Over the past 24 hours the greater than 10 MeV GOES proton flux was slightly elevated, remaining well below radiation storm levels. The proton flux is expected to gradually return to nominal levels over the next day, with a small chance of exceeding minor storm levels if any high-energy flares or eruptions occur.

Electron fluxes at geostationary orbit

The greater than 2 MeV electron flux, as measured by GOES-16, was below the 1000 pfu threshold over the past 24 hours. The greater than 2 MeV electron flux, as measured by GOES-18, exceeded the 1000 pfu threshold between 17:00 UTC and 22:10 UTC on April 04. There is a chance that the greater than 2 MeV electron flux will exceed 1000 pfu threshold level in the coming days. The 24-hour electron fluence was at normal levels and is expected to remain so over the next 24 hours.

Today's estimated international sunspot number (ISN): 180, based on 15 stations.

Solar indices for 04 Apr 2025

Wolf number Catania	210
10cm solar flux	180
AK Chambon La Forêt	050
AK Wingst	033
Estimated Ap	036
Estimated international sunspot number	181 - Based on 29 stations

Noticeable events summary

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

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